When one of Minnesota's wealthiest scions goes missing, it's up to Sherlock Holmes and Doctor Watson to track a cold-blooded killer.

The year is 1896, and the magnificent winter carnival is under way in St. Paul, Minnesota, when Holmes and Watson are summoned by the city's most powerful man, railroad magnate James J. Hill. A wealthy young man has disappeared on the eve of his wedding - and his fiancée suspiciously discards her wedding dress. After a grisly discovery in the carnival's ice palace leads to a flurry of clues, Holmes is on the case.

His pursuit of the murderer takes him through the highest echelons of St. Paul society and into cahoots with Shadwell Rafferty, a gregarious saloon owner and part-time private investigator. Soon Holmes, Watson, and Rafferty are embroiled in a perilous adventure that takes them from one frozen corner of the city to another and out onto the treacherous ice of the Mississippi River as they trail a cruel and ruthless killer.