If I've read it once, I've read it a dozen times: the religious thriller, where the plot hinges on a secret ancient document that, if discovered and publicized, would change the face of Christianity, topple powerful religious figures, and shake the commitment of the faithful. The premise rests on a sort of reverse fundamentalism: The notion that any such document, if proven genuine, must be telling the absolute truth (and of course it must -- otherwise why would all those evil clerics have conspired to keep it hidden?).