In the heart of a snow-blanketed London, as the festive season dawns, Detective Inspector Arthur Stowe is entangled in a case of missing children, a baffling mystery that has stymied him for over a year.

When a possible lead ties a potential murder victim to the heart of the Yuletide legend, St. Nicholas, the case spirals into the realm of the unbelievable. Enter Chris Demer, an ordinary man ensnared in a destiny beyond imagination. He meets Winter, St. Nicholas's enigmatic, battle-axe wielding daughter, who is on a mission to resurrect her fallen father.

With the malevolent Krampus casting a shadow over the festivities and a government clouding the spirit of the season, the stakes have never been higher. As Chris discovers his latent powers, and with Stowe's detective acumen, a dramatic race against time ensues. Guided by a sleigh, whimsical sausage dogs, and the shimmering London skyline, can this unlikely trio salvage the essence of Christmas from impending doom?