"Adrian Harvey, London wine merchant, has lost the Christmas spirit. Someone is stalking him, stealing his post and vandalising his shop. When the police question him after an anonymous tip-off, he's more than anxious. He's scared. And who is that nun? Long time neighbour and friend DI Beatrice Stubbs is dispatched to Germany to investigate a series of apparently related art thefts, so Adrian seizes the chance to flee the city. He follows her to Hamburg to do some Christmas shopping and visit his ex. Yet the stalker is still on his heels. While Beatrice is on the trail of a violent gang of mercenary thieves, Adrian runs from danger to the remote island of Sylt. But danger follows and Adrian has run too far. From the icy streets of Hamburg, to the canals of Amsterdam, and the snowswept beaches of Sylt, Beatrice and Adrian discover how a virtue taken to extremes can lead to deadly sin".