In the fall of 1888, Jack the Ripper slaughtered five prostitutes in London’s seamy Whitechapel District. He did not just kill — he ripped with a butcher’s glee — and then, after the particularly gruesome slaying of Mary Jane Kelly, he disappeared. For 127 years, Jack has haunted the dark corners of our imagination, the paradigm of the psychotic killer. We remember him not only for his crimes, but because, despite one of the biggest dragnets in London history, he was never caught.