Warlock Holmes may have demons in his head, but now Dr. John Watson has a mummy in his bloodstream. Specifically that of the sorcerer Xantharaxes, who when shredded and dissolved in an 8% solution, results in some extremely odd but useful prophetic dreams. There's also the small matter of Watson falling for yet another damsel-du-jour, and Warlock deciding that his companion needs some domestic bliss...
Warlock Holmes - The Sign of Nine
"If you ever wondered how much better Sherlock would be if people could hurl hellfire at each other, well this one is for you." Starburst Magazine on A Study in Brimstone