Four Clans who've been at peace for many moons, a young medicine cat troubled with a dangerous secret that she's trying to keep hidden, a young apprentice worried about her mentor and her strange behavior, and growing tensions with two new Clans. Mosspetal, medicine cat of FrostClan, is struggling to keep her Clan from finding out that she's broken the medicine cat code. Her apprentice, Featherpaw, is beginning to grow suspicious of her mentor when she begins to grow Ill. Will the Clan ever figure out what Mosspetal is hiding from them? Or will she keep this secret to herself forever?