Codex, Lev Grossman.  A great buildup, but a disappointing ending. This has been compared to other literature-themed bestsellers, Dan Brown's series and The Rule of Four among them (it even references one of the same obscure medieval books). But there's so much suspense surrounding the discovery of the codex, and the integration of the videogame that to wrap it up with the protagonist's loss and exile is ridiculous. No motivational clues, nothing about the meaning of the Easter Egg, and little about the banal historicity of the faux text. I'm almost angry enough to try and write a better ending, but I don't have the time.