The story of THE THREESOME revolves around Estelle (Mélissa Désormeaux-Poulin), a strait-laced, 34-year-old wife and mother whose life is settling into a predictable, boring rut. A series of events challenges her identity to the point where she finally realizes that the cause of her existential crisis is... sexual. Way out of her comfort zone, she challenges herself to organize a threesome, and gets her husband Simon (Martin Matte), who is just as awkward as she is, in on the action!