Sleeping dogs /

When an anonymous tip lands on his desk, DS Adam Tyler is intrigued in spite of himself. A tantalizing new lead in a 24-year-old unsolved disappearance is something he just can't ignore, even while juggling a new boss, a heavy caseload and the early days of a fledgling relationship. But the letter triggers more than just a fresh investigation, and a shocking chain of events soon leaves him fighting for his life. With Tyler out of action, DC Mina Rabbani must step up to lead the Cold Case Review Unit in his absence, retracing Tyler's steps and uncovering his secrets to figure out what he was working on. But as the case starts to hit frighteningly close to home, she realises that this time her mentor can't protect her. That now she's the one with hard choices to make. That this time she's on her own. And that sometimes the truth is best left buried.