User blog comment:Master Sima Yi/Assassinews 03-12-'14 — New Assassin's Creed in Victorian London leaked/@comment-24159499-20150127045820/@comment-24159499-20150130211145

That was my conclusion as well - something interesting as a side mission, and yet non-conclusive and unsolvable. Hopefully, Ubi makes it more intriguing and rewarding than The Headless Horseman.