When Tobias, Jake, Rachel, Marco and Cassie were given the ability to morph, they were also given one very important warning: Never stay in a morph for more than two hours. But Tobias stayed in his morph for too long. Now he's a hawk -- with a boy's mind -- forever.

And he's starting to forget what he looked like. He's losing control, and wants to give in to the hawk brain inside him. Tobias knows he can't give up, but he's spotted a rat down below. He turns in midair and plummets down to the earth. He's focused. He's determined. He strikes...

This is the third book is the regular Animorphs series.