Paperback, 166 pages
English language
Published Jan. 10, 1998 by Scholastic Inc..
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Having learned that someone has discovered proof of alien life and hidden the proof on the top-secret base called Zone 91, Cassie and the Animorphs struggle to keep the evil Yeerks away from the place.
Subjects
- Extraterrestrial beings
- Science fiction
- Juvenile fiction
- Metamorphosis
- Fiction