The Decision (Animorphs #18)

Ax and the Animorphs face a new challenge when they morph into mosquitoes to evade the Yeerks, but their plan goes awry, and they find themselves trapped in Zero-space with no way back to Earth and limited oxygen. An Andalite scout ship discovers them just in time, offering a possible escape. As Ax finally reunites with his own people, he faces complex feelings about returning home. This installment explores themes of identity and belonging amid high-stakes adventure.