London married Elizabeth Mae (or May) "Bessie" Maddern on April 7, 1900, the same day "The Son of the Wolf" was published. Bess had been part of his circle of friends for a number of years. She was related to stage actresses Minnie Maddern Fiske and Emily Stevens. Stasz says, "Both acknowledged publicly that they were not marrying out of love, but from friendship and a belief that they would produce sturdy children." Kingman says, "they were comfortable together... Jack had made it clear to Bessie that he did not love her, but that he liked her enough to make a successful marriage."