The Island of Thirty Coffins(1979)

The story takes place in 1917. Véronique is a young woman of 35 years, nurse at the military hospital of Besançon. She suddenly learns of the murder of her husband, the mysterious Count Vorski, whom she has not seen for fourteen years. Her research will also lead her to the track of her father and son whom she believed to have died in a shipwreck, already a long time ago. From clue to clue, here we are in Brittany, on this island with a name so ill-fitting... Brutal deaths, enigmatic words written... by whom? A frightening prophecy, the superstitious terror of the island's inhabitants, and suddenly, Veronica d'Hergemont can no longer leave this island. She's stuck alone. Almost alone...