I'm currently reading the sixth book in the Assassin's Creed series (I think it's the sixth), Black Flag. Normally, I wouldn't choose to read a story that's been adapted from a game into a book, but it was a gift, and my friend really wanted me to read it. And it's turning out better than I expected. It's a book that covers parts of the story not told in the game, with some areas not fully explained. It's almost finished—I recommend it.
(My first forum post on the site :)