It's Christmas at The Emporium, a bespoke gift shop hidden in the depths of London's winding streets featuring handcrafted delights unavailable anywhere else. Tinsel coils around the wooden beams, lights sparkle in the windows and the open fire crackles comfortingly. As closing time approaches after a busy trading day, only a few customers drift towards the exit - but they find they cannot leave. The doors are locked.
What initially seemed an innocent mix-up turns sinister as the shopkeepers seem strangely uninterested in lending assistance. The festive cheer has all but disappeared among a growing feeling of unease - and then a chilling discovery is made in Santa's grotto.
For those that survive the night, it will be a Christmas to remember.