Darkheart, a warrior of moon clan. She's a heartless crule she-cat. But what happedned? What made her this way? Why does she hate kits? And what about the reckless promise she made when she was young? Could that destroy her whole life? This is darkhearts story and how she became the cat she is now.....

Generations after the main series, the five Warrior Clans become scattered by countless enemies cooperating in a large-scale attack. They have only recently recovered and rearranged themselves. Only, they are then confronted with a fatal pathogen which is slowly consuming them from the inside. On the outside, rogues draw unsuspecting Clan cats into their ranks, and drive the others out. In response, StarClan desperately issues a prophecy to assist the lake cats, and to receive help in quelling the re-rising Dark Forest that overwhelms them. Only, the Clans never receive it. Without StarClan to guide them, will the Clans survive on their own? Or will this be the destruction of their very foundations?