ThunderClan's leader, Bramblestar, has been behaving erratically after losing one of his nine lives, and suspicion is quickly spreading across Clan borders. And when a strange apparition sparks unrest in SkyClan and ShadowClan, each warrior must decide where their allegiances lie--with their Clan, or the warrior code itself.

Packed with action and intrigue, this sixth Warriors series is the perfect introduction for readers new to the Warriors world, while dedicated fans will be thrilled to discover the new adventures that unfold after the events of A Vision of Shadows.