At 40, Miriam radiates serene beauty and tranquility, a confidence and self-assurance as vast as the sea close to her summer home. There are no taboos in the polished, urbane life she shares with her partner André and their 15-year-old son Nils; there is understanding and tolerance. If Nils invites his 12-year-old girlfriend Livia to spend the holidays with them, fine. But when the brazenly sensual Livia begins flirting with an older man, Bill, Miriam feels it is her responsibility to stop the questionable relationship. But as she does so, it is she herself who falls for the shy and charmingly insecure Bill. Miriam forges ahead, seducing him, seeing him secretly. But it is Livia that Bill loves, not Miriam. And suddenly the vast horizons of her life vanish in a fog of jealousy and rejection - emotions that prove to be far less controllable than she thought...