London, 1896. Madame Tussauds opens to find one of its nightwatchmen decapitated and his colleague nowhere to be found. To the police, the case seems simple: one killed the other and fled, but workers at the museum aren't convinced. Although forbidden contact by his superior officer, Scotland Yard detective John Feather secretly enlists 'The Museum Detectives' Daniel Wilson and Abigail Fenton to aid the police investigation.