Set in the theatre district of London’s West End in 1953, a production of Agatha Christie’s whodunit The Mousetrap seems to be cursed after the body of flagrant director Leo Kopernick (Adrien Brody) turns up dead after the show.  The jaded Inspector Stoppard (Sam Rockwell) and rookie investigator Constable Stalker (Saoirse Ronan) are assigned to the case, and it seems as if everyone’s a suspect: the actors, the crew, the waiting staff and, to Stalker’s…