On a clear moonlit night, standing alone on a Scottish mountain, DI Kelso Strang hears the unmistakeable howl of a wolf. But it is not the only unsettling thing about the remote village of Inverbeg, where he is taking a break with an old army friend.
Sean Reynolds is obsessive about rewilding his estate and there are rumours that he has taken steps to hurry it on, to the anger of the local farmers. And there are other tensions too: an elderly lady had died some months before, officially in a tragic stumble off a cliff path, but she was burdened with ugly secrets and her best friend believes she was murdered.
When fresh horror strikes Inverbeg, Strang feels that further retribution is at work, but as the ground keeps shifting under his feet he faces his biggest challenge yet.