It is 1873, and as the economies of Europe threaten to crumble, Mycroft Holmes finds himself in service to the Crown once again. A distant relative of Queen Victoria has been slain by the Fire Four Eleven killer, a serial murderer who leaves no mark upon his victims, only a mysterious calling card. Meanwhile, Sherlock has already taken it upon himself to solve the case, as his interest in the criminal mind grows into an obsession.

Mycroft begrudgingly allows Sherlock to investigate, as Ai Lin--the woman he is still in love with--needs his aid. Her fiancé has been kidnapped, and the only man who might know his fate is a ruthless arms dealer with a reputation for killing those who cross him. Mycroft persuades his friend Cyrus Douglas to help find the young man, but Douglas himself is put in harm's way.

As Sherlock travels the country on the hunt for the Fire Four Eleven murderer, both he and Mycroft will discover that the greed of others is at the root of the evil they are trying to unearth...