This play won the Guinness World Record for Longest Theatrical Run in 1958, when it played its 2,239th performance. For 10 points each:
[10e] Identify this theatrical whodunnit, based on the real-life murder of Dennis O'Neill, that follows seven strangers trapped at Monkswell Manor during a blizzard.
ANSWER: The Mousetrap
[10m] When her plays Witness for the Prosecution and Spider's Web joined The Mousetrap onstage in 1954, this creator of Hercule Poirot became the only woman to write three plays that ran simultaneously on the West End.
ANSWER: Agatha Christie
[10h] In Christie's first stage play, Black Coffee, Hercule Poirot solves the murder of Sir Claud Amory with the help of this anxious World War I veteran who often assists Poirot.
ANSWER: Captain Arthur Hastings [or Arthur]
<Elizabeth Cowan , Literature - British drama>