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Police officer Luke Fitzwilliam is travelling to London by train. As often happens, he strikes up a conversation with his fellow passenger, Miss Pinkerton, who is on her way to Scotland Yard to report a series of mysterious murders in the provincial town of Wychwood. Luke, of course, doesn't believe a word of it, thinking the old woman is just too emotional.
So Luke goes to Wychwood to investigate the case - not as simple as it seems at first glance.