La guerre des clans, cycle 7, tome 2

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.

Titre original : Warriors, The Broken Code, book 2: The Silent Thaw (2019)