For fans of the Warrior Cats franchise, this action-packed sequel follows Zephyr, a tank-bred axolotl newly freed into the lake whose rebel faction is intent on destroying the Immortal Code.

Zephyr isn't out to make friends. After a grueling escape from an axolotl breeding facility all he cares about is being reunited with his sister Luna. He places his trust in Neptune, a wise tiger salamander, who promises to look for her. But the search is fraught, and Neptune refuses to venture above in the dark. Feeling betrayed, Zephyr sets off on his own and soon encounters Jasper, an ambitious axolotl hungry for power. Zephyr quickly finds himself embroiled in a fight between axolotls who believe regeneration is the key to survival and others who want to evolve and roam free. The struggle for power is vicious, and there are many more dangers waiting for them both above and below the surface of the lake.

This thrilling adventure is complete with legendary battles, incredible alliances, and a moving search for a sense of belonging at the heart of it all.