One of the reasons I love reading books by Roger Zelazny is that he had an incredible talent for coming up with stories that will twist your brain around. They are not only great science fiction and/or fantasy, they make you THINK, and I doubt two people ever come away from reading his books with the same impressions and thoughts. "Lord of Light" follows in this tradition of his works perfectly.
"Lord of Light" takes place on a planet that was colonized from earth. The leaders of this planet found a way to make themselves virtually immortal through technology, and now they rule the planet having stylized themselves as the gods of the Hindu pantheon. If they were just leaders, this might not be a problem, but they are definitely corrupt.
Nobody dares oppose the leaders though, they are gods after all! Well, except for the man who was once known as Siddhartha (among other names) and now he usually goes by Sam. He is known as the Binder of demons and the Lord of Light. He was one of the original colonists and he has just as much power as the self-stylized "gods" do.
Now Sam has begun a subversive mission to under mine the "gods" of his world. How he goes about it is rather complicated, you'll have to read the book, but its definitely one of the things that makes this a mind-twisting read! In fact I doubt I understood everything Zelazny put in the book, just like I did with his Amber books I'll probably read it again at some time so that I can get more from it!