This week we're thrown back in time to Victorian Successville, where guest rookie Martin Kemp is tasked with solving the very first Murder in Successville. Local lady of the night Rita Ora has been found slayed in an alley, and DI Sleet and Kemp are tasked with retracing her last steps around the cobbled streets of Successville. They investigate Will-i-am, a science professor who has always got the better of Sleet. Martin Kemp's investigation is disrupted, however, when Will-i-am tricks Sleet into drinking truth serum. Paloma Faith is the landlady of the local brothel where victim Rita worked. Martin Kemp and Sleet go undercover as criminal brothers - the Neville brothers - but there is some confusion as to who is supposed to be the cooler brother. Jonathon Ross is an upper-class gentleman who had no idea that his girlfriend Rita was working at a brothel. Sleet and Kemp go undercover to a gentleman's club where they manage to get invited to dine with Jonathon Ross and his good friend Jamie Oliver. With all three suspects facing execution by the firing squad, Sleet and Martin Kemp have to pick who they think the real murderer is. Have you kept your eyes and ears open for clues? Could you take out the right person?