About “The Unknown”
In this 1998 novel by Katherine Applegate, Cassie and the Animorphs learn that someone has discovered proof of alien life and hidden it on the top-secret base Zone 91. They struggle to keep the evil Yeerks from finding the place.
Book details
- First published
- 1998
- Latest edition
- 2017 · ISBN 9781338216554
More: Wikidata · Open Library
View more editions (5)
| Cover | Edition | Year | ISBN | |
|---|---|---|---|---|
 | Unknown (Animorphs #14) | 2017 | 9781338216554 | Buy on Amazon |
 | The Unknown | 1999 | 9780613044998 | Buy on Amazon |
| The Unknown (Animorphs, Book 14) | 1998 | 9780590665414 | Buy on Amazon | |
 | The Unknown (Animorphs, Book 14) | 1998 | 9780590494236 | Buy on Amazon |
| | Animorphs | 1998 | 9780590494236 | Buy on Amazon |