To get you in the spirit of Halloween, witf is airing MASTERPIECE: MYSTERY! "Poirot XI: Hallowe'en Party" at 6 p.m. on October 30.

In this episode, Ariadne Oliver (Zoë Wanamaker, Harry Potter) returns to join forces with suave Belgian super sleuth Hercule Poirot to investigate a drowning at a Hallowe’en Party. As they look further, they uncover a series of mysterious deaths in the village. Are they connected?

Watch a preview for this episode below.