It is 1873, and Mycroft Holmes is in service to the Crown once again. A distant relative of Queen Victoria has been slain by the Fire Four Fifteen killer, a serial murderer who leaves no mark upon his victims. Mycroft allows Sherlock to take the case, as he has been asked to find a missing person-the fiancé of the woman he loves. As Sherlock hunts for a murderer, both he and Mycroft will discover that greed is at the root of the evil they must unearth...