Back to Before(2000)
(The fourth book in the Andalites, Animorphs, Megamorphs series)
A novel by Katherine Applegate
Jake's finally weakened. After a grisly battle, the Drode offers the Animorphs' leader an escape from the terrifying pressure. He'll reverse the decision to start the Animorphs. Now, there's no morphing, no missions, and no knowledge of the Yeerks. That is, until very strange things begin to happen and Jake, Rachel, Tobias, Cassie, Marco and Ax are forced to confront their new reality.
Used availability for Katherine A Applegate's Back to Before
May 2000 : USA Library Binding
April 2000 : USA Library Binding
May 2000 : USA Paperback