Plot: London's West End, 1953. As The Mousetrap, 's latest murder mystery play, celebrates its 100th performance, preparations are in progress for a film adaptation. Instead, a horrible backstage murder brings the ambitious plans to an unexpected standstill. Now, everyone involved is a suspect. And as seasoned Scotland Yard inspector Detective Sergeant Trotter and his enthusiastic assistant Constable Stalker sift through a long list of potential murderers, the question arises. Can the mismatched duo crack the knotty case before the shadowy killer strikes again??
Alternative Plot: In the West End of 1950s London, plans for a movie version of a smash-hit play come to an abrupt halt after a pivotal member of the crew is murdered. When world-weary Inspector Stoppard (Sam Rockwell) and eager rookie Constable Stalker (Saoirse Ronan) take on the case, the two find themselves thrown into a puzzling whodunit within the glamorously sordid theater underground, investigating the mysterious homicide at their own peril.
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