A twisted serial killer is on the loose and only Terry and Gemma's coach tour knowledge can help the police find the murderer.

Johnny Vegas and Sian Gibson return to our screens as Terry and Gemma who, having decided to quit the coach tour game are trying, and failing, to become private investigators. We follow Terry and Gemma battling obsessive figurine collectors, pasty poisoners, and a serial killer only Terry can catch. Big crimes, big laughs, woefully inadequate investigative ability.