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. 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.

This week DI Sleet and his sidekick Reggie Yates are going undercover on a stag do, spending 24 hours in Successville's top hotel. Sure there's a murder to solve, but try telling that to an excitable murder detective who has found out there's a karaoke bar. So, when undercover detective Noel Edmonds is found dead in a bedroom, in what looks like a sex game gone wrong, it's up to Reggie to lead the investigation. The pair must infiltrate an assassins convention at the hotel, being held by the manager Michael McIntyre.