Who is the killer in The Mousetrap?

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The murderer comes to the guesthouse where snowbound visitors are trapped. He calls himself Sergeant Trotter and says he is a police investigator. In fact, he is only pretending to be a police officer.

In reality, the murderer is named Georgie Corrigan, the oldest of three Corrigan children who were abused by their foster caregivers. The youngest died as a result of the abuse. Georgie Corrigan is now murdering the people he considers complicit in his youngest sibling's death. These include Maureen Lyon, one of the foster parents who abused the Corrigans. She served jail time, but now is free. Corrigan also murders Mrs. Boyle, one of the magistrates who assigned the Corrigan children to the Lyons. Georgie is exposed while trying to murder Mollie, a teacher who never responded to a letter from the youngest Corrigan pleading for help. 

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Having actually seen a production of Agatha Christie's murder mystery The Mousetrap, I am violating an informal pledge to not divulge the murderer's identity. Christie's play has been performed continuously for 64 years, and at the end of each performance, in London's West End, the audience is asked by the cast to keep confidential the murderer's identity. That said, the murderer is revealed as Sergeant Trotter, an idiosyncratic late-comer to the quintessential Agatha Christie setting, an isolated retreat at which is assembled the pool of suspects. Trotter's appearance at the snowbound inn that provides the play's solitary setting is unsettling, as he does act sufficiently peculiar so as to invite suspicion -- a not unremarkable reaction given the nature of the story. The "who-dunnit" nature of Christie's work, however, is intended to keep audiences guessing, and suspicion is deliberately directed toward the interestingly-named "Christopher Wren," an architect whose peculiar mannerisms exceeds even those of the individual calling himself "Sergeant Trotter." That English history does, in fact, include a famed 17th century architect named Christopher Wren does serve to direct suspicion towards this character, but, as noted, Trotter's behavior seemed a bit unsettling, and it was no surprise when he turned out to be the murderer whose real name was Georgie and that he was at the center of the chain of events, as a child, that has brought this particular group of individuals together.

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The murderer is actually Trotter, the man acting as the investigator.

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