If you've looked at the screenshots and are still on the fence, do youself a favor and watch some videos. The gameplay is an amazing live-action comic book. Oh sorry... Graphic Novel. (Ok, NOT sorry, they'll always be comic books to me)
This is a murder mystery that takes place in Fabletown. Think "Who Framed Roger Rabbitt" only with non-cartoon violence, extremely foul language and a touch of nudity thrown in. Don't get me wrong, I'm on board with all of those things, but parents and prudes may want to give this one a wide berth.
All of the main characters are fables who now live in New York City and masquerade as normal citizens. You've probably heard of most of them, Snow White, Ichibod Crane, the Brothers Tweedle, Mirror Mirror, and The Big Bad Wolf as the Sheriff. Sound corny? Think again. This story is complex, engaging and VERY well executed.
There is a lot of exposition in this game, but there is a count-down timer on your dialog response, and you'll need to keep your fingers on the AWSD keys and the mouse because there is also some fast action dodging and punch throwing, and you'll also need to pound the Q key for all you're worth (EDIT: turns out you can just hold it down, but I still prefer pounding it...) to power through some confrontations.
The only downside is that the saves occur automatically and infrequently. Don't start playing unless you have at least a half-hour to give.
I can't say enough about this game. The good folks at Telltale really know how to spin a good yarn.