Changeling: The Lost is a game that I've posted material about before.
The premise of the game is that your character was a normal per
son, kidnapped for some reason by the otherworldly and inhuman fae (known as Keepers). While in the faerie world your body was changed to suit the needs/desires of your captor. You could have been made a soldier, a beastly hound, or even a doll to be admired and locked away. However, this wasn't the life you desired and you fought your way back through the Hedge (border between worlds, which appears to be a hedge of thorns) to the world.
Unfortunately once you returned, you found that you no longer belonged. The time in the fae world changes a person. In addition, one can't simply return to his or her former life. When a person is taken the Keeper replaces them with a construct double, known as a fetch. To protect themselves and find purpose, the Lost (as the changelings are called) band together in Courts (tied to Seasons and emotions).
Changeling is a fun game. Of the World of Darkness games, I think it is my favorite. It's a faerie tale game true to its origins. Faeries are big, bad, scary monsters. They are fearsome and unearthly. The work of Neil Gaiman is very Changeling-esque, especially Neverwhere, Coraline, and MirrorMask.
If you would like to try Changeling for yourself, you can download a demo here.