Basically a rambling and seemingly almost pointless story of the investigations of the co-author (Peter Moon) with loosely connected chapters purporting to make (or find) connections among families called Wilson, Cameron and Crowley plus "some of the most colourful characters in recent history" - Jack Parsons and Cameron (his wife) as well as L. Ron Hubbard (of Scientology), for whom Moon had worked and who was said to be involved in the early stages of the Montauk Project.
The second in a trilogy of which "Montauk Project" was the first, it is a smoother and better-written continuation in the form of several loosely connected topics and chapters on the theme of secret government paranormal experiments. It is followed by "Pyramids of Montaulk", which I preferred. Thereafter there are four more books: "The Black Sun", "Synchronicity and the Seventh Seal", "Montauk Book of the Dead" and "Montauk Book of the Living", in that order.
For me, the only really interesting bit in this book was the last chapter, the one before the epilogue, which contained an exposition about virgin births or moon children (actually known as magical children). It is only for this that I have even given the book 2 stars, despite having given the first (previous) book 5 stars for the information it contained, although it was disjointed and badly written.
The virgin birth chapter was almost the only place where a far-out claim was clarified. Whether one accepts the clarification is not the point I am making here but rather that the book was studded with many (virtually off-the-cuff) stunning allegations, made without any kind of clarification or explanation. The author would then move on, leaving me stymied. When I got to the last book, "Montauk Book of the Living", I found the virgin birth was repeated and extended - plus much, much more - so would recommend that instead.
P.S. Having now read all seven of the Moon books related to Montauk, I would suggest reading "The Montauk Project" (the first of the series, which contains shocking information but is very disjointed), "Synchronicity and the Seventh Seal" (the most edifying of the middle books), and "The Montauk Book of the Living" (the last book, which is amazing). One caution: the books are all irritatingly badly written, but the clearly explained occult information justifies the effort.