Unknown
Edición de la obra The Unknown
| Autor | Katherine Applegate |
|---|---|
| ISBN-13 | 9780590114004 |
| Número de Cutter | A648u |
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.