Mystery in Venice is set in post-World War II Venice, on All Hallows’ Eve, and is a terrifying mystery that features the return of the celebrated detective Hercule Poirot. Poirot is now retired and living in self-imposed exile in the most glamorous city in the world, and reluctantly attends a séance in a haunted, crumbling palazzo. When one of the guests is murdered, the detective is drawn into a sinister world of shadows and secrets.