From the website of Richard Leigh, co-author of The Holy Blood And The Holy Grail:
"Richard Leigh has recently completed a novel, tentatively titled Grey Magic, in which an antinomian hermetic numinist confronts the conflict between artistic detachment and political commitment set against the turbulence of the Civil Rights Movement in Mississippi, the Vietnam War, and the troubles in Northern Ireland."
Hmm, I can see publishers trampling each other in the rush.
Incidentally, Mr Leigh and one of his colleagues are suing Dan Brown, author of the moderately succesful The Da Vinci Code, for plagiarism, because he "stole their idea that Jesus had a child". Since Leigh claims that The Holy Blood is factual, I'm not entirely sure what he thinks he's doing. If you put an intellectual idea in the public domain, claiming that it's (sorry) gospel, don't you want as many people as possible to agree with it? Isn't this case a bit like Matthew and Mark suing Luke and John?
Update, Mar 1: Go here for further discussion. Much of which is suspiciously similar to the above. Which doesn't necessarily prove plagiarism of course - could be that my original thoughts were entirely banal and unimaginative. Which is my whole point, really.