I think this goes with my Velikovsky and Danniken books.

Traces serpent and shamanic cults, chalices and alchemy through history, myth and Arthurian legend from Europe to the Americas and the Orient as well as current medical research tying the origin the dual healing and killing aspects of venomous snakes. ( )

Minimally researched (I could have written the first 3 chapters myself, just with information off the top of my head - of course I wouldn't: I would have included references and whose ideas, and why my conclusions were such and such...), and really quite dull, this book brings in little snippits of information from all over the world where they seem superficially connected, but actually are not at all.
Ooh look, a Hopi word that bears similarity to the sound of a Celtic word - they must be linked... what crap.
Sorry, I thought this book was not really very good, but now I come to review it, it makes me annoyed I wasted my time with it. This is not a new field for me, so I suppose if you are wholly ignorant of anything concerning the grail it might be...
No, scrap that - much of the information is supposition based on incomplete research, or just making stuff up.
So don't read this, it's poor, and that's the nicest thing I can say about it. ( )