Roxana Orlac, a famous violinist, loses the use of her hands in a terrible lift accident. Her career as a virtuoso seems to be over until Professor Christansen offers her a transplant of two new hands. What he omits to tell her is that the two hands in question belonged to a woman who murdered her own children. When unexplained incidents happen, followed by a murder in Roxana's entourage, she starts to wonder whether her new hands may be committing crimes of which she's unaware. Police Capitain Almeida, in charge of the investigation, falls in love with Roxana, but she remains the prime suspect. Is it possible that Roxana's hands are urging Roxana to do terrible things she's not even conscious of? Or is she the victim of some terrible plot?

Un criminel évadé d'un hôpital psychiatrique enlève la femme et la fille d'un policier, Thomas Crosky, dit Cross.

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.

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