On the cover of the book we see two wooden combs; they are also inside the book in a full-color full-page plate (Figure 102), presented as if they had been found in the ruins of Qumran. In fact, they were not. These two combs were found far away in a cave in Wadi Murabba'at and long published in P. Benoit, J.T. Milik, and R. de Vaux (eds.). Les grottes de Murabba'at (DJD 2; Oxford: Clarendon Press, 1961), part 2, Planches, pl. XIV.8 and XIV.9.
The book, early on, declares it wishes to remove the "burden" of religion from Qumran, and seeks to move religious Essenes out. But in the end it--contradicting itself--seeks to move religious Sadducees in.
But second temple period Sadducees were a small aristocratic conservative group, that Josephus tells us persuaded "few," a group preferring Torah-only, not books with named angels, predestination, resurrection, apocalyptic, messianism--the very things found at Qumran. Sadducees, though they may have agreed with Essenes on this or that legal question, did not own or approve of such books. Retrojecting later, broader and looser definitions of Sadducees helps little.
For further information about the factual errors in this book, see the online paper [if interested, google the title] "Jannaeus, His Brother Absalom, and Judah the Essene."