Wolfe, Gene. The Fifth Head of Cerberus. New York: Ace Books, June 1976. ISBN: 0312890206
Courtesy of Tim Bray, this classic Sci-Fi novel. I found it somewhat confusing at first, but still intriguing and obviously filled with things that I missed. I flew through it in about a week, so I guess that means I liked it. You may wish to check out Cave Canem, a web site dedicated to the book, that helped me understand a lot more of what I read.