Book
The UnknownKatherine Applegate
Sci-FiYoung Adult

The Unknown

166 pagesFirst published 19987 editions · 2 languages
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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.

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Book 14 of 44 in Animorphs

Reading order
  1. The VisitorKatherine Applegate2
  2. The EncounterKatherine Applegate3
  3. The MessageKatherine Applegate4
  4. The PredatorKatherine Applegate5
  5. The CaptureKatherine Applegate6
  6. The StrangerKatherine Applegate7
  7. The AlienKatherine Applegate8
  8. The SecretKatherine Applegate9
  9. Animorphs - The AndroidKatherine Applegate10
  10. The ForgottenKatherine Applegate11
  11. Animorphs - The ReactionKatherine Applegate12
  12. The ChangeKatherine Applegate13
  13. The UnknownKatherine Applegate14
  14. Animorphs - The EscapeKatherine Applegate15
  15. The WarningKatherine Applegate16
  16. The UndergroundKatherine Applegate17
  17. The DecisionKatherine Applegate18
  18. The DepartureKatherine Applegate19
  19. The DiscoveryKatherine Applegate20
  20. The ThreatKatherine Applegate21
  21. The SolutionKatherine Applegate22
  22. The PretenderKatherine Applegate23
  23. The SuspicionKatherine Applegate24
  24. The ExtremeKatherine Applegate25

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Editions

7 in Spinefolk
FormatPublisherYearPagesISBN
EditionScholastic, Incorporated2017—9781338216554
EditionTandem Library1999—9780613044998
PaperbackRavensburger Buchverlag19991729783473348640
EditionScholastic19981669780590665414
Paperback · freGallimard19982239782070519699
PaperbackScholastic Inc.19981669780590494236
Edition———9780590114004
Juvenile fictionScience fictionMetamorphosisExtraterrestrial beingsFictionChildren's fictionExtraterrestrial beings, fiction