I've read a couple of his books in the hope that there'd at least be something original contained within, Sign and the Seal was a load of hackneyed, ill-informed twaddle and Fingerprints of the Gods was a rip off Erich Von Daaniken. Amazing that all his books claim knowledge about the origins of mankind and lost civilisations but none actually provide any evidence. As Nigel said he "writes stuff to extract money" and I'll take my hat off to him, he's very good at it.