The Unknown
Edición de la obra The Unknown
| Autor | Katherine Applegate |
|---|---|
| Editorial | Tandem Library |
| Fecha de publicación | October 1999 |
| Idioma | inglés |
| ISBN-13 | 9780613044998 |
| ISBN-10 | 0613044991 |
| 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.