On September 25, 1888, a news agency received a mysterious letter taunting the police that he would never be caught. It was a defining moment in time, as this was when the serial killer was given a name. The letter was infamously signed, "Jack the Ripper." Though the letter was presumed to be the creation of a writer—not the killer—it gave the killer an identity. "Jack the Ripper" appeared big and bold on the front page of the newspaper a couple of days later.
September 30, 1888, marks the day when the third and fourth of the canonical five murders occur. At around 1 a.m., Elizabeth Stride was slain, but the Ripper may have been rushed. Forty-five minutes later and a few blocks away, Jack killed Catherine Eddowes.
At 11:34 p.m., a demon leaves Hell to issue a Test of Mettle to the Ripper. We have to assume Jack survives his Test of Mettle because a fifth victim is soon to appear. A surprise ending reveals the fate of the demon, the Ripper, and one of the victims. As an added twist, the story is told from the demon's point of view.