The Unknown by K.A. Applegate

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There's a new rumor in town. Someone has discovered an item that proves life on other planets exists. And they've been hiding it on a base called Zone 91. The Most Secret Place On Earth.

Cassie, the other Animorphs, and Ax already know about life on other planets. Too well. They also realize the Yeerks will try to access Zone 91. To find out if what's there will threaten their mission. So the Animorphs decide to pay Zone 91 and the Yeerks a little visit. But what they discover is not at all what they expect. . . .

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Animorphs

Book 14

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Paperback

First Edition Feb 1998 Apple (Scholastic) ISBN 0590494236

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Paperback

Jan 1998 Scholastic ISBN 0590665413

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Paperback

Mar 1999 Scholastic ISBN 059011400X

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Hardcover

Jan 1998 Turtleback Books ISBN 0613044991

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Hardcover

Jul 1998 Turtleback Books ISBN 0606128751

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eBook

Jun 2017 Scholastic Inc. ISBN B071RMS71R

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eBook

Jul 2017 Scholastic ISBN 1338216554

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The Unknown

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