Three Christmases since the Reichenbach Falls, Sherlock Holmes has little appetite for mince pies or for solving crime. Wandering through Victorian London, he meets a grown-up and not-so-Tiny Tim Cratchit who implores him to investigate the mysterious death of his reformed benefactor, one Ebenezer Scrooge.

An impossible murder, a threatening letter, and a missing diamond – it’s just enough to intrigue the great detective. But it’s a dark and treacherous Christmas Eve, and once again the night is haunted by the spirits of the past, present, and future. Using his powers of deduction, can Holmes overcome his own ghosts to crack the case?