A commissioner and a former examining magistrate are asked to find a woman, whom they both loved, just disappeared.

Stumbling across an uncompleted 1939 film called "Princess Marushka", filmmaker Sam becomes intrigued with the young actor Sylvain Marceau, who last appeared in the film. Hoping to discover the mystery behind Sylvain's disappearance, Sam decides to make a documentary and sets off to interview those who knew Sylvain, including elderly Lisa Morain. Through her interview, Sam learns the story of Lisa and Sylvain's doomed love affair on the eve of World War II.

Violette Castillon, a young Parisian lawyer, goes to the Île de Ré where a criminal named Stany claims her to ensure his defense. In exchange, he will tell her the truth about his father, the late robber José Rocca. The day after Violette's arrival on the island, Stany is attacked, a notable from the region is found hanged and other misfortunes befall the island. While the dead are multiplying around her, Violette is determined to discover the truth.