This sounds like just another of the "Gnostic Gospels" many of which were discovered in Dag Hamadi (sp?) in Egypt in the 1940s. Written a couple of hundred years after the real Gospels, they were a heresy well-known from history - though the actualy works didn't reappear til the 1940s.
Really, there is no "there" there. Its an old story. It is interesting from a historical perspective, but as for religious guidance its credibility is close to nil...
You are referring to the Neg Hamadi scrolls and yes, this sounds very similar.
Interesting from a historical perspective, as this sort of thing does show some of the tribulations of the early Christian Church.