Warriors: The Unknown Threat Series Book #2: Endless Rivalry

ShadowClan's threat still hangs in the air. Lionblaze is trying to keep ThunderClan thriving and Bramblestar isn't helping. The ThunderClan leader has fallen into a deep depression and Lionblaze wonders if the old Bramblestar will ever return. And according to Shadecloud, ShadowClan isn't the biggest threat after all...