When the end of the world came, it was not an end to all life. Flora thrived, with nothing to hold it back, strangling all who dared to oppose it. Some fauna prospered, whilst others suffered. The food chain was altered. Now more prey than predator, cats are forced to band together in colonies to survive. Moth is coast cat, a safer colony isolated from the rest of the world. Curiosity ends that, plunging Moth and his companions into the terrifying world of the Overgrown and the rival colonies that inhabit it. Moth soon finds, however, that there is something out there that is an even greater threat to their survival than the predators that hunt them.