We have grown so comfortable with the notion of “Jack the Ripper,” the unfathomable, invincible male killer, that we have failed to recognize that he continues to walk among us. In his top hat and cape, wielding his blood-drenched knife, he can be spotted regularly in London on posters, in ads, on the sides of buses. Bartenders have named drinks after him, shops use his moniker on their signs, tourists from around the world make pilgrimages to Whitechapel to walk in his footsteps and visit a museum dedicated to his violence.