Celebrated sleuth Hercule Poirot, now retired and living in self-imposed exile in Venice, reluctantly attends a Halloween 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.
An amateur artist sketching in a churchyard has a series of encounters with a young woman, who we might come to believe is a ghost. In fact, the truth is stranger than that.
