We can't tell you who we are. Or where we live. It's too risky. And we've got to be careful. But everyone is in danger. Yeah. Even you.

When Tobias and his friends were given the power to morph, they were also given an important warning: Never stay in a morph for more than two hours. But Tobias broke the time limit, and now he's trapped in the body of a hawk -- forever.

Tobias won't give up, though. The Animorphs made a promise to fight. So when he discovers an important Yeerk secret, he knows he has to do everything in his power to destroy it. But to do so, Tobias will have to contend with a part of himself that's wrestling for control -- a part that isn't human.