Alright, I'm very...biased towards browser-based games, and usually they don't capture my interest, and I don't play them for more than a day or something. This one caught my eye though, while browsing around.
It's about mystery. You complete actions in an alternate world london where shady things go on all the time, and the game tells its plot (Yes, it has one!) via your actions. No combat or anything, you use items that you obtain and your character skills to get through events with persuasion, and other skills you'd use in real life.
Give it a go, pretty unique from what I've seen.