In 1951, the body of Maxime Montenegro was found on the banks of the Lachine Canal a few days after his mysterious disappearance. Detectives Antonio Gratelli and Eduardo Ramirez were at the heart of the investigation. The trail led them to the victim's widow; Suzanne, an enigmatic and seductive woman who would become the prime suspect in the tragedy, along with Daniel Legrand, her new husband and mafia boss.