 As the detectives struggle to solve the mystery of Jason’s death, they also battle their own problems.Susan finds herself in a puzzling relationship with a fellow DC, and tensions that have been brewing for some time between Banks and his wife Sandra finally come to a head.Banks also has to face the challenge of working with Chief Constable Jeremiah "Jimmy" Riddle, a high-flyer who favours a hands-on approach to the job, and who is more concerned with appearances than he is with truth.