Mark Gatiss (Sherlock) adapts Agatha Christie's Hallowe'en Party in the final new Hercule Poirot episode of the season, Sunday, July 3, 2011, on MASTERPIECE MYSTERY!. Ariadne Oliver (Zoë Wanamaker) joins forces with Poirot (David Suchet) to investigate a drowning. They soon uncover more mysterious deaths. Are they all related?I'm looking forward to the return of Wanamaker as Ariadne Oliver, and with a script by Mark Gatiss, this season of Poirot should end on a high note!
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