Pierre and Elisabeth, a couple in their thirties, move with their baby into a cottage on a lake for the summer. The setting is idyllic, and the couple's happiness seems within reach. Every day, Pierre goes to work in the city while Elisabeth rehearses for an upcoming voice recital. Despite the benevolent presence of her mother-in-law who lives in the neighbouring house, the young woman feels isolated and overwhelmed in her new role as a mother. Her entourage is concerned, but no one fully grasps the extent of Elisabeth's distress. Muted violence soon takes hold and tightens its grip.