Fermont is a small mining town located in northeast Quebec where the body of a young dancer is found. Quebec police send Detective Céline, one of her most experienced professionals, to investigate the case. The colony is isolated from the outside by a structure surrounded by a huge wall that makes life absolutely claustrophobic. There Céline will accidentally meet a person from her past whom she will have to face while she is in charge of the investigation. In a completely snowy landscape where things do nothing but get complicated you will discover that everyone on the wall had something to do with the victim.