Cassie and the other Animorphs have a few little problems. A few very little problems. Actually, the problems call themselves Helmacrons. They're less than an inch tall, and they're pretty upset at Cassie. They believe she stole their ship. Cassie thought it was just a toy and gave it to charity. Now the Helmacrons want it back.So the Animorphs have a new dilemma. Because the Helmacrons have their own secret weapon: They can shrink other beings down to their size. And if they don't get their ship back soon, everyone on the planet is in for a little surprise...

The Helmacrons want revenge on Cassie because they believe that she stole their ship.

The Animorphs must find a way to send the Helmacrons, a tiny alien invader, back into space before it is too late.

Someone's looking for Tobias. Someone who says she's his long-lost cousin. Tobias isn't sure the person is telling the truth, but she's really nice, and knows a lot about him. And what she tells Tobias definitely gets his attention.It seems a lawyer has discovered Tobias's father's last will and testament. So, Tobias needs to attend the reading. His cousin even offers to go along. But something just doesn't feel quite right. That's when Tobias and the other Animorphs decide to do a little checking on this "cousin." And what they discover will change the rest of Tobias's life...

Marco and the other Animorphs have managed to find out where the Yeerks are planning to build their next ground-based Kandrona. That's a good thing. But the location is supposed to be somewhere near the North Pole. That's a bad thing. The Animorphs know that the Yeerks are a "cold-blooded" species, but this is a little nuts! Who wants to be near the North Pole without Arctic morphs -- and wearing spandex?Even so, the kids know that if the Yeerks succeed with their plan, Earth is pretty much done for. And Marco and the other Animorphs aren't quite ready to give up the fight.

Ax and the Animorphs have always believed Ax was the only non-infested Andalite on Earth. That he alone survived the terrible battle between his people and the Yeerks.Until now.There were other survivors. Other Andalites. And they're here on Earth. Trying to keep a low profile. Trying to find a way to defeat Visser Three. Trying -- like Ax and the Animorphs -- to stay alive until help finally comes.If help finally comes...