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 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.