DCI Alan Banks is back, and this time he is investigating the murder of one of his own. Respected Officer DI Bill Quinn has been shot through the heart by a bolt from a crossbow while convalescing at the St. Peter’s Police Treatment Centre, and the initial investigation uncovers compromising photos with a very young woman in his room. Assigned to assist DCI Banks is Professional Standards Inspector Joanna Passero, and as the investigation progresses they uncover a link with a cold case that takes them to Tallinn, Estonia to unearth the truth.