Grace is a religious woman who lives in an old house kept dark because her two children, Anne and Nicholas, have a rare sensitivity to light. When the family begins to suspect the house is haunted, Grace fights to protect her children at any cost in the face of strange events and disturbing visions.

On the island of Jersey, off the French coast, Mélanie, a beautiful woman gifted with a captivating personality, enjoys having unimportant love affairs that her husband Victor, a perfumer older than her, seems to endure with total indifference.