It all started harmlessly enough. An egged window. A deflated car tyre.

A few garden gnomes knocked over. But then, the silent calls began - late nights and early mornings, to landlines, and mobiles, and to numbers that no one should have access to. At their wits' end, three former British Army soldiers, now living in the Highlands of Scotland, have no choice but to turn to the police for help.

And that is when the killing starts. Brought in to lead the case, Detective Chief Inspector Jack Logan finds himself locked in a battle of wits with a meticulously organised murderer. A murderer who has been planning all this for a very long time…