Books like The Unknown by Katherine Applegate
In this exciting addition to the Animorphs series, Cassie and her team learn that evidence of extraterrestrial life has been discovered and concealed on a highly classified military installation called Zone 91. The Yeerks, always keen on gaining new intelligence, launch a daring attack to seize the site. Cassie and the other Animorphs must use their morphing powers to defend the base and keep the alien evidence out of enemy hands, all while navigating the perilous politics of the organization’s command structure.
First publish date: 1998
Genre: Science Fiction/Space Opera
Authors: Katherine Applegate
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