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. A sarcastic, know-it-all American, on loan from the FBI, who seems determined to alienate everyone while dragging Angus into a shadowy world of conspiracies, lies, and violence. It's been 12 days since the Fortnight Killer last struck - the investigation's running out of time. The darkness is growing, and if Angus isn't careful, it'll swallow him whole.