The time has come for three kits of ThunderClan—Hollypaw, Jaypaw, and Lionpaw—to become apprentices. Grandchildren of the great leader Firestar, all three possess unusual power and talent. But dark secrets surround them, and a mysterious prophecy hints at trouble to come. The warrior code is in danger of being washed away by a river of blood, and all the young cats' strength will be needed if the Clans are to survive.