Best selling crime novelist Charles suffers from terrible writer's block and is struggling to finish his first screenplay. His picture-perfect new wife Ruth is doing her best to keep him focused so they can fulfill her dream of leaving London for Hollywood. Charles' quest for inspiration leads him to invite the eccentric mystic Madame Acarti to perform a seþance in his home. He gets more than he bargained for when Madame Acarti inadvertently summons...

Now retired and living in self-imposed exile in the world's most glamorous city, Poirot reluctantly attends a séance at a decaying, haunted palazzo. When one of the guests is murdered, the detective is thrust into a sinister world of shadows and secrets.