I came into this reading experience knowing only the cover of this book. It shows a (top-nude) female centaur and a scaly green lizard in a tight-fitting red vest smoking a cigar acting shocked to see what looks like a haggard Robert-Redford circa late-80s type sitting in a chair with divine light glowing from behind him. This scene is definitely in the book, so points there, right off the bat. As this is Vol. 4 in a series there are some serious narrative problems I, a newby to the Well World Saga, encountered over the course of the text. Certain scenes, particularly in the last third, were basically incomprehensible.
The first 100 pages or so are spent introducing this big bad menace to Galactic Civility As We Know It called the Dreel, who are basically a Borg/Pod type collective intelligence that take over and assimilate other lifeforms by virally invading through nasal cavities. You don't want to get close to someone exhibiting Dreel-like behavior. Super-efficient, they can take over whole planets this way in, like, weeks.
The cigar-smoking lizard creature is named Markoz, a high level undercover investigator/enforcer whose species (officially referred to as the Chugach (Mountain range reference???)) is immune to the Dreel and is chasing them across the galaxy trying to contain and exterminate. He seems to serve the same role in this series as Tyrion Lannister in Game of Thrones: comic relief, treated like an outsider by his peers (because of shallow judgements based on physical appearance) yet with an insider's sway and connections that allow him to move anywhere in the story, Markoz is also remarkably difficult to kill off.
But then the Dreel just get completely dropped from the story for mostly centaur-related reasons, which is understandable. An entire planet, Olympus, of 2 million Centaurs (or Olympians as they are known galaxy-wide) is introduced in satisfyingly anthropological detail. There are secretary-centaurs, police centaurs, snipers, frat-boy sex slave centaurs, it's rich stuff. Although he doesn't just come out and say it, Chalker clearly thinks of the Centaur as the highest possible form of intelligent life in the universe. And he may be right. Centaur Platonism would be a good album title.
All this ends up being the dressing for introducing Nathan Brazil, title character and entity with a serious identity complex. Honestly, having read the book I still cannot adequately explain who/what Brazil IS. Quantum superposition is invoked. Revisionist Judaeo-Christian theology (the most unnecessary and embarrassingly written passages of the entire novel, for sure). Captain Horatio Hornblower. Chalker just can't seem to make up his mind. It reminds me, typing this now, of Starbuck in the Battlestar Galactica remake. A bunch of hand-wavy stuff just get thrown out there and is left unexplained.
The novel ends on a Matrix Reloaded-style cliffhanger as a body is discovered, presumably setting up the action for the fifth and concluding volume in the series. I cannot say I am intrigued enough to read this volume, but if, in a few years time say, I found myself browsing the crusty bookshelfs of some youth hostel around South America or Thailand and came across another of Jack Chalker's tomes, preferably something written later than 1979 allowing for him to develop his craft and knowledge of technology more, I would probably pick it up. Which is way more than I can say for Piers Anthony. I'll probably make another attempt to finish Centaur Aisle later this month but I need a break...