Detective Surprenant, a veteran of major crimes in Montreal who took refuge in the Magdalen Islands, investigates the murder of a teenage girl with the help of his colleague Geneviève Savoie and inexperienced police officers, even giving up his vacation to resolve this sad story. However, he must deal with the arrogant chief inspector Sébastien Gingras, dispatched from Quebec City and with whom he has disagreements.
The Arsenaults, a close-knit family who profit from illegal hunting, have ruled the roost for several generations in Témiscouata, Quebec. The return to the fold of Anthony, the impetuous youngest of the family, then the arrival of Émilie, a radio host who exercises an ascendancy over Anthony and his older brother Adam, will come to test the harmony of the clan.