Lord of Light, Roger Zelazny
I came away with two impressions of the book, interest and confusion. It starts by diving right in by introducing various gods who aren't gods having returned from... Somewhere along the line it went to a flashback and started explaining things a bit more. It's a world with men, gods (men who arrived long ago with technology and powers), and the natives (who seem to bit spirits of sorts.) This almost ended up on my pile to go to the charity shop but I think it deserves at least one more read, maybe I can figure it by then.