The one-phrase rundown: not bad, but not great, either.
I was intrigued by the story when I saw the book in the Canyonlands VC, as it seemed like a local myth. It is indeed, but more to the Grand Canyon than the upper Colorado or Green, where I was.
The disappearance of the Hydes is a myth which has grown all out of proportion to its beginnings, and in that regard the book is well-researched and explains the reality of the 80-year old case: the contemporary (well, the 70s and 80s) twists and turns, what is known, and importantly, what is not. Some this was fun reading.
However, with the plentitude of historical facts and sometimes interesting sidelines came a tedium that was eventually too much for me. In retrospect, I would have been happy learning about 1/3 of the information contained in the book.
I suspected that I might get TMI when I started reading the book, so I can’t complain too much about reading about previous generations of the victim’s families. The author, a boatman himself, goes into detail about the scow (the type of boat the couple took), the hydraulics of the river, and the rapids the Hydes would have faced, as well as various locations in the Grand Canyon, which enrich the story but ultimately meant very little to me. I highly suspect that locals, canyon folks, and in particular river runners, would get more out of the story thus told.