The Secret — K.A. Applegate

We can't tell you who we are. Or where we live. It's too risky, and we've got to be careful. Really careful. So we don't trust anyone. Because if they find us...well, we just won't let them find us.

The thing you should know is that everyone is in really big trouble. Yeah. Even you.

There's something pretty weird going on in the woods behind Cassie's house. The place where Ax and Tobias call home. It seems the Yeerks have figured out one very important thing: Andalites cannot survive without a feeding ground. Visser Three knows the "Andalite bandits" don't feed where he does, so there can only be one other place.

Now Cassie, Marco, Jake, Rachel, Tobias, and Ax have to figure out a way to stop a bogus logging camp. Because if Visser Three finds Ax in the woods, nothing will stop him from finding the Animorphs....