It is 1873, and Mycroft Holmes finds himself in service to the Crown once again. A relative of Queen Victoria has been slain by the Fire Four Eleven killer, who leaves no mark upon his victims, only a mysterious calling card. In this third outing by NBA legend Kareem Abdul-Jabbar, 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 now the Holmes brothers must contend with both a serial killer and a ruthless arms dealer with a reputation for killing those who cross him.