When the chief suspect in the notorious Peek-a-boo cop killer case blew himself up, almost taking lead investigator DCI Duncan Bone with him, the psychologically damaged detective thought his days on the force were over. But when another PC is abducted and murdered in the same deranged Peek-a-boo fashion, Bone is persuaded to return to lead the new investigation. But as Bone and his team hunt a copycat killer, and with time running out before yet another cop is slain, Bone’s terrifying past returns to tear open old wounds and push him to very edge of the abyss.

In the heart of Scotland's whisky country, a killer lurks amongst the casks. When renowned distillery guide Hamish Durie drops down dead during a whisky tasting, seemingly poisoned by his family's own liquid gold, DCI Bone is thrust into a world where tradition and treachery collide. Peeling back the layers of deception, Bone uncovers a toxic blend of deep rooted family feuds, corporate back-stabbings, and a sinister connection to Glasgow's underworld kingpin, Frankie Feelan.

Detective Constable Angus MacVicar has just landed his dream job – transferred out of uniform and assigned to Oldcastle’s biggest ongoing murder investigation: Operation Telegram, hunting the “Fortnight Killer”. Every two weeks another couple is targeted. One victim is left at the scene, their corpse used as a twisted message board. The second body is never seen again. This should be the perfect chance for Angus to prove himself, but instead of working on the investigation’s front line, he’s lumbered with the forensic psychologist from hell.

When the body of a local artist is found mutilated inside a five-pointed star, DCI Tanner’s attention turns to the disciples of a Satanic cult. But when the man's body is discovered to be the cult’s leader, Tanner's interest is soon drawn to his will, and the five beneficiaries who’ve been named in it.

In the shadow of the Pentland Hills, a man has been callously struck down in front of his home. Tyre marks suggest it was no accidental hit-and-run. Somebody wanted him dead and as the man fights for every breath, they might still get their wish. Grappling with the demons he thought he could leave behind after months away on enforced leave, D.S. Malkie McCulloch resists pressure from his superiors to pass the case on to the road policing unit, convinced that whoever was behind the wheel will be waiting for the chance to finish the job.