After their trip to Middlesbrough turned a little more explosive than they thought, Gemma and Terry finally decide to pack up the smouldering remains of their coach tour business and set out on a new adventure as fully-fledged private detectives.
With Terry and Gemma's relationship on the rocks, Terry is forced to reconnect with his old friend Willy Watkins, leaving Gemma to investigate crimes solo - until Monica gets in on the act. Their hunt leads them to things in Terry's past.