It turns out that you do know Jack: Assassin's Creed Syndicate's Jack the Ripper DLC launches next week, and he seems to be someone familiar.
Joint protagonist Evie Frye returns for the standalone adventure, set twenty years after the events of the game. Through a combination of sleuthing, strong-arming and classic straight up murder, she must unmask the Ripper before it's too late.
The DLC can be obtained as part of the season pass or purchased separately. It's available from the 15th December for PS4, PC and Xbox One.