As Dovepaw hones her powers, her sister Ivypaw grows jealous. It gets to the point where they will no longer speak to one another. This causes Ivypaw to not tell her sister about her nighttime journeys to a dark place where a strange cat taught her fighting moves that where more powerful than anything her mentor taught her. But this strange cat is Hawkfrost. An evil cat that was banished to the Dark Forest for his crimes. He convinces Ivypaw to convince Firestar that ShadowClan is going to try and destroy ThunderClan. In fact, even Ivypaw herself believes it, but she lies to convince Firestar. She claims she had a dream. In which the rivers are flowing with ThunderClan blood, and ShadowClan is taking over. Of course, she had no such dream. ThunderClan fights ShadowClan, ressulting in Russetfur is killed by Lionblaze, and Firestar loses another life.

Ivypaw is jealous when she discovers Dovepaw's special powers. She also beings training with Hawkfrost in the Dark Forest. At the end, urged by Hawkfrost, she claims to have had a dream telling ThunderClan to take territory back from ShadowClan. In the ensuing battle, Firestar loses a life, and Russetfur is killed by Lionblaze.