Fresh from maternity leave, Detective Elma finds herself confronted with a complex case, when a man is found murdered in a holiday cottage in the depths of the Icelandic countryside - the victim of a frenzied knife attack, with a shocking message scrawled on the wall above him. At home with their baby daughter, Saevar is finding it hard to let go of work, until the chance discovery in a discarded box provides him with a distraction. Could the diary of a young boy, detailing the events of a long-ago summer have a bearing on Elma's case? Once again, the team at West Iceland CID have to contend with local secrets in the small town of Akranes, where someone has a vested interest in preventing the truth from coming to light. And Saevar has secrets of his own that threaten to destroy his and Elma's newfound happiness.