There's a hitman in Glasgow: unpaid and angry, he's decided to settle his own debts... Marianne Brogan can't sleep. She's plagued by a nightmare: someone in the shadows, whispering threats, stalking her every move. To make matters worse, Marianne can't get hold of her brother, Billy. Despite knowing some shady characters from Glasgow's underworld, Billy's always been there for her - until now. Meanwhile, DCI Lorimer and his team are...