At a Halloween Party, Joyce Reynolds claims she previously witnessed a murder, and next minute, she's dead. Poirot is called in to investigate as more bodies are uncovered.
Meanwhile in Venice a Joyce Reynolds claims she can talk to spirits, and next minute she's dead. Poirot doesn't have a choice but to investigate, he's already there.
Two stories, both based on the same Christie novel, but how much in common do these tales have, and can Poirot catch the killer in both cases? Of course he can, he's Hercule freaking Poirot!