I got the game on Saturday and I'm on A Dance With The Devil (I've only got 3 Silent Assassins so I'll go back). My problem is that whenever I take out the CIA agent while he's in the bathroom, the chef always finds him (dunno why he sees through walls so I tried sedating him which didn't work because a guard saw through the wall too). So I waited until he got in the lift and I killed him there and took his clothes (after killing Eve and retrieving the info). Then I went down to hell and I killed Vaana in her office and my suspect bar went red and I dunno why because nobody saw me... Then I really struggled and eventually died trying to take out Maynard. Any tips for this mission and particularly the points I made?

You can kill Vaana when she is walking down, next to the rails with the water underneath, i simply just pushed her, and instant death.

Thanks, people! I'm on Amendment XXV now!

Yeah, actually it would've been easier to kill the CIA agent in the bathroom in his portable. When he gets in, you sneak in after him, close the door, and kill him. No one checks on his portable anyways...

but you can't close the bathroom stall doors!

Yes you can, its a huge stall so it should be big enough for you to hide in a corner, wait for him to start urinating, and close the door...he's dead. and for Vaana...I always prefered burning her to death with the Pyrotechnics

If you hide in the cubicle before he goes in there you can close the door, kill him and open the door the opposite way so you can get out without the body blocking the door.

I actually found the best way to kill the CIA agent was to go to hell first and go to the elevator and climb the hatch. When he leaves the heaven party he eventually gets on the elevator and you can strangle him there.

I've come up with a walkthrough on how to do this mission. Might be long, but might be worth reading for those having trouble.

When you start the mission, equip a silenced silver baller (or two) and than equip a silenced rifle with a advanced scope. Also I think you should buy a advanced rifle case so that detectors don't find the rifle (like when entering the elevators.) It also might be a good idea to buy some pain killers while you at it, so maybe the little show down you do with that devil looking guy will be a little easier. I haven't yet found a way to kill him and avoid the gun battle ... Anyway. After you equiped your stuff, start the mission.

Once you start. keep your rifle and rifle case throughout the mission! Walk inside the office, the camera will see you, but not to worry, you can easily steal the video tape after you steal one of the guard's uniform. Walk up to the desk with the guard, talk to him and he'll start walking in the back room. Tail him, when he stops in the closet, pull out your silver ballers and use him as human shield by pressing X. Press X again to knock him out, that way you won't have to use one of those things. Take his uniform and head outside of the office, kind of act fast because there is another gaurd that comes in that area and if you do this at a wrong time, you could get caught, so don't take your time too much.

Now, go left after exiting the room, there is another do on the other side of two elevators, go inside it (WITH your guard uniform) and with the uniform, you won't have any problem. Now, once you enter the garage, turn left and go down some stairs. Or you can turn right and go into the little room outside of the garage and steal the video tape, just in case you forget about it later on. Now once you go down the stairs, turn right. Walk a little ways and keep looking to your left, you'll see a door which has a cam above it. If you stole the video tape, I don't think you'll have to worry about anyone seeing you. But still check your surroundings before making a move. Once you go into the door, make your way down stairs. Be careful going through the door down stairs, as you're not suppose to be here and there are guards in the area. Try to steal one of the staff's clothes without the others seeing you. What I usually do. Once you walk through the door, look to your right and you should either see one or two staff members. If there are two, wait and one of them will go away, but be careful, he heads toward you, so hide back in the stairs until he passes. Now there should be only one, if you wait a bit, he'll go into the room next to him, act fast be QUIETLY and get behind him and knock him out with your silver ballers. Now, take his clothes and hide the body in the wooden box. Now, head back where you came from, but don't go back up stairs yet, just head straight and then make a right. Walk a little ways and you'll see a little control area. That's where Vaana does her little "show" thingy. Go to one of the control things and you should be able to rig something, and it'll kill her for you! In other words, making her death look like an accident! Nobody will EVER find her! The flames catch her on fire and she falls in the water and the shark eats her. lol! After you're done with that, head back to the garage, but before you start going up stairs, you migth should go into the kitchen looking area and hide your silver ballers in a crate, put the crate inside the small elevator hatch and send it to the top floor. But there is a staff member that goes in there, so do it when he's not in there. Now go back to the garage, once in the garage, bank left and head toward a white truck and you should see a heaven's uniform behind it, take that uniform. But be careful, make sure nobody sees you because for some reason I got shot at when a guard saw me change clothes, so ... yeah. Once you got the uniform, you should have no other weapon with you but your rifle. Okay, now go to the right side elevator and let the staff search you, they hopefully shouldn't detect your rifle, if you bought that advanced rifle case thingy. After they search you and if it's safe, go inside the elevator and go to the top floor.

Once you're at the top, wait. Don't go outside of the elevator, just wait till the door clothes and climb the hatch. Now just wait there! Sooner or later the CIA agent will walk in. But don't strangle him YET! I've strangled him while the elevator was going down and it's REALLY glitchy! One time when I did it, I flew up in the air and when I hit the ground I died! The next time the CIA body fell through the hatch and it was found, the third time the game FROZED on me! So don't strangle him until the elovator is near the garage, but you might want to try to kill him before the elevator door opens, so nobody will likely see you. After you kill the agent, take his uniform and make your way back to the top floor. Keep YOUR rifle case, don't bother with the CIA's rifle. Okay, once you make it to the top floor. Go straight (try avoid making contact with that girl you have to kill) try to kill the girl before collecting the info, so you don't have to fight the bitch in that room. BTW, she's the girl who sings on the stage. In that case, once you enter the area with all the naked chicks and such, make your way back stage and into the kitchen, don't worry, nobody will suspect you with the CIA uniform on. Go to the little elvator hatch thing and there is the crate with your silver ballers inside! Now take the crate into the little room where nobody will see you, take you silver ballers and exit the kitchen. Once exited the kitchen, go left and than right into the area with the "kind of big" stair case. Go up the stairs and there are at least TWO guards that goes up there, so make sure you knock them out using your silver ballers. There's really no point in trying to hide the bodies. Now once that area is clear, finally, take your rifle out of the case and get into a good position. Wait till the chick starts singing on the stage, when she does. KILL the bitch! Now you can safely go into that room and steal the info without having to deal with her. Now take the elevator back down to the garage. Once it gets to the garage, you can just climb the hatch and while up there, you can find a little short cut to the other elevator on the other side, which goes down in the basement. Don't go the other way as you could be seen by a guard!

Now take the elevator to the basement. Make your way through the area until you meet up with the devil looking dude. He'll talk to you, now follow him into the torture room and battle him! You may use your silver ballers for this, or try using your rifle if you still have it with you. Or pick up one of the machine guns. All I can say is: know where he's at before making your move! Once you spot him, shoot his ass! With the rifle, you can zoom in on his head! If you're low on health, use your pain killers. When you kill him, steal the storage key from him and get the HELL out of there! Go back to the garage and make you're way to the van and escape! Don't forget about stealing the video tape from earlier. This is the time to get it if you forgot it! Now you can finally escape! Mission complete. I can't promise you you'll get a Silent Assassin rating though ...

It takes a bit of work, but you can make it into the car park without having to kill anyone.

You can take guns with you, but it makes entry a little harder. If you plan on bringing any guns in you'll need to follow the bolded instructions. (the sniper rifle is an exception, and can be brought in safely if you really want.)

Entry:
walk up to the security booth and crouch next to (not underneath) the window.
When the guard in the booth turns away from the window you can move forward. Stay against the wall and the camera won't see you. Stop underneath the camera.
If you look down into the car park, you should see a guard in front of you some distance away. When he turns and starts to walk away from you, move forward. (You can cover the entire distance in stealth, but it's tight: it's safe to run until you clear the wall, which you should still be hugging unless you want to be caught on camera. There are two cars directly in front of you, you want to get next to the right hand one, put it between you and the guard, and crouch.
From this position you should edge forward towards the railing, staying in crouch. A guard should walk into view on the level below, stop, turn around and go back the way he came. When he turns around you can go down the stairs (which are ahead and to your left) and follow him.
This will take you towards the back door to the basement (which is just around the corner on your left), wait until the camera is pointed away from you, then run up to the door and crouch in front of it.
When the camera looks away from the dumpster you can move towards it, stay against the wall.
From here you willl want to crouch and go behind the parked vans - carry on all the way across, and wait next to the cab of the farthest one. (You should be able to see the nearby guard from here by looking to your right).
When the guard moves away, you can go forwards, towards the van in front of you with the rear doors open, stay in crouch.
When you get to the van, put the heaven guest outfit on. Now you have free movement in the parking lot and you don't have to worry about the guards (but you still want to steer clear of the cameras).

Walk up to the heaven elevator and enter it. (You will be frisked here)
if you have a gun you will need to take out the guard who is on the right hand side of the elevators (sedate him, and throw him in the dumpster, but watch out for the other guards in the parking lot: they move around quite a bit.) When he's gone you can pick the lock on the door he was guarding and get access to the elevator that way.
Once in the heaven area head straight to the toilets and enter the right hand cubicle; wait behind the door.
When the CIA agent comes in, wait for him to start peeing, close the cubicle door, and kill him. Take his suit and leave the cubicle. (make sure you close the door behind you)

From there things get a whole lot easier because you now have almost total freedom of movement.

Go to the private room and wait in the closet. (make sure the singer is on stage first)
The singer will enter, look around, then walk up to the window at the far end and make a phone call. Kill he while she's on the phone. You don't have to worry about the body - no-one else goes in there.

Check the laptop, then go down to hell and kill the other two.

My preferred methods are engaging the other assassin in the duel, and sabotaging the pyrotechnics to kill the woman. But by this point you have many varied options.
Just be aware that it will initiate a cutscene if you get too close to either of them. (the assassin will offer you the duel, and the woman will want to meet you for the exchange)

Once they're dead you can go back to the parking lot, collect your outfit, and exit via the car. Just watch out for the guards when you put your normal clothes back on.

This is my strategy for getting the Silent Assassin rating. Once the game starts head right till you get to the security office. Wait for the guard to turn away but stay where you are. When he looks at the window and looks away again sneak across and make your way down while hugging the wall. When you get to the end, take a right and then sneak behind the car and cross the small space between the trunk and the wall. My game gets a little glitch sometimes when crossing but it's no big deal and you can make it across. Sneak up on the guard, take him hostage, knock him out, take his clothe, and then dump him in the dumpster. Pick the lock to the door he was facing and get on top of the first elevator and drop your weapons there. Make you way back and head to the van with the heaven costume. Make sure the cop is not around and change clothe. When you get in the elevator climb up the hatch and get your weapons. *This part is a little hard so I suggest you save here.* Walk up to the guard on the right and stand next to him. Wait for the one on the left to leave and the one on the right to head for the doors. Sneak up on the guard on the right and take him hostage, walk a little forward so the door can close, knock him out and take his clothe. Run past the office and pass the guard heading the way you came, take him hostage and knock him out, drag his body into the security office then drag the other body into the office. Head for the elevator and if the guard is alone know him out and drag him to the office. Wait in the elevator and the CIA agent should be arriving shortly. Take him hostage and knock him out and leave him in the elevator. Head back up and take the civilian hostage and knock him out. Take the CIA agent's clothe and throw him over the rail. Wait for Singer to finish and a guard should enter through the doors facing the elevators. Take him hostage and knock him out. When the singer enters the office and starts talking on the phone, sneak up behind her and take her hostage. Knock her out and throw her over the railing near the elevator and then check the computer. *Save now because it would be a bitch to die and have to repeat all this.*Make your way down and enter the second elevator. If you are wearing the CIA suit, the guards should give you no trouble. Once you head down wait for Vana to head to the dance floor and hugging the wall make your way to the pyrotechnics controls, rig them and then hide. After Vana steps on the stage forget about her. Get every guard in the back area alone and knock them out and then hide their bodies. Once none of the guards left patrol the area, drag one body into the area that can be seen from the outside when the doors are opened. *Save here because this part is a bitch* Check the map and wait till there isn't anybody looking at the doors and open them. If you did it right, only the bartender should come running. Close the doors, stand behind them and wait for him to arrive. When he opens the doors quickly close them and sneak up behind him. Knock him out and throw him to the sharks. Exit the area and escape. *I had gotten SA on this mission before but had knocked out the bartender before he reached the body. I am not sure if having a body discovered affects your rating, but if it does then try some other method of attracting the bartender's attention*

I Hope this walkthrough helps.