animorphs :the visitor

Author: K.A. Applegate

Main characters:Rachel,Cassie,Jake,Marco,Tobias

summary- In this book the animorphs (animal morphers) send Rachel to acquire a cat but to do that first she has to catch the cat and what better way to do that than to morph into it's prey, a shrew! So she sends Tobias to catch the shrew then she acquires it and morphs it and then the cat comes down she demorphs and acquires the cat then morphs and sneaks into a known controllers house to find out how he communicates with Visser 3  it turns out that he communicates with a Z-space transponder (a transponder to talk to someone in Zero-space).