Yvonne is a young woman living in Quebec in the latter half of the 19th century, under the controlling influence of both her elder sister, Hélène, and the repressive Victorian society that pervades the area. Yvonne has a sensual passion that her sister hopes to extinguish by placing her in a convent. As summer arrives, a strange dream suggests a different future, and Yvonne confronts the unexpected return of both her mother and her first love.

Jean-Charles has an unusual relationship with his mother. He can't break free of her influence even when writing his master's thesis, made up of interviews with the several hundred men who have slept with her. Jean-Charles can identify -- he's one of them. But the incestuous bond between mom-and-son is jeopardized when Jean-Charles meets Cassandra, and Mom shifts her attentions to a hot young stud in retaliation.