Enjoying a quiet life after moving to Cornwall, Ed and TJ couldn't be happier. Their tranquillity, however, is shattered when a bitter resident drags up their past - a violent and tragic past they dearly want to forget.
When Ed unearths a 150-year-old mystery while renovating their house, and as they set about investigating it, they uncover damning details that takes a terrifying turn, exacerbating the resident's hostility towards them.
Their situation becomes worse when Ed's friend, DCI Bob Brown, asks him for a favour. Ed knows it wouldn't just be a case of 'give Roly a knuckle sandwich and job done'; life is never that simple for Ed.
With recent events and his fragile mental health, Ed is caught in a situation where he has to choose between breaking his promise to TJ to stay out of trouble, or help Bob. There is only one outcome and soon Ed finds himself drawn in the criminal underworld of ex-London gangster Harry Daniels.