Joseph Mersault, his wife Anne, and their daughter Renée struggle to make ends meet and think their traps are being hunted by the return of a rogue wolf. Determined to catch the predator in the act, Joseph leaves his family behind to track the wolf. Anne and Renée grow increasingly anxious during Joseph's prolonged absence and struggle to survive without him. When they hear a strange noise outside their cabin, Anne hopes it is Joseph but instead finds a man named Lou, who has been severely injured and left for dead. The longer Lou stays and Joseph is away, the more paranoid Anne becomes, and the idea of a mysterious predator in the woods slowly becomes a threat much closer to home.