The Dead of Winter by Stuart Macbride

It was supposed to be an easy job.
All Detective Constable Edward Reekie had to do was pick up a dying prisoner from HMP Grampian and deliver him somewhere to live out his last few months in peace.
From the outside, Glenfarach looks like a quaint, sleepy, snow-dusted village, nestled deep in the heart of Cairngorms National Park, but things aren't what they seem. The place is thick with security cameras and there's a strict nine o'clock curfew, because Glenfarach is the final sanctuary for people who've served their sentences but can't be safely released into the general population.
Edward's new boss, DI Victoria Montgomery-Porter, insists they head back to Aberdeen before the approaching blizzards shut everything down, but when an ex-cop-turned-gangster is discovered tortured to death in his bungalow, someone needs to take charge.
The weather's closing in, tensions are mounting, and time's running out - something nasty has come to Glenfarach, and Edward is standing right in its way...