Trapped in a life of stifling domesticity and emotional neglect, Martha (Carine Bouquillon) harbors a dark and forbidden obsession that goes far beyond a standard affair. The "young lover" she is secretly involved with is not a stranger, but her own adult son, Julien (Jérémie Petrus). The film depicts their transgressive and incestuous relationship as a desperate, twisted attempt to find intimacy within their crumbling family structure. While Martha maintains the facade of a devoted wife to her husband, she engages in a high-stakes betrayal that crosses the ultimate social taboo. This psychological drama explores the disturbing reality of a mother who chooses a carnal bond with her son over her marital vows.