Eira is a girl who is used to hunting. As a matter of fact, she belongs to the Caste of The Wolves so for her 16th birthday, she will be able to hunt her first big prey: a human being that does not deserve to live according to the rules of her society. The Hunters are the population controllers and as such they must decide which members of the society are worthy to stay alive or to kill. The problem is that Eira will start doubting that she is the one to choose who lives and who dies, therefore she will have to confront her conservative family in the disagreement of their beliefs and rituals.