I'm slowly working my way through the Game of Thrones series by George RR Martin. I'm on book 5 now-A Dance With Dragons. Totally engrossing, and believe it or not, a far more complicated world, characters, and "history" created and more fully realized even than Tolkien's, and he was a master. In Martin's world, the line between good and evil is far more ambiguous, and the worldview much more dark and cynical, perhaps reflecting our current age. For this series, I got into it backwards after binge-watching the series and becoming totally engrossed in the various characters and intrigues, shocking developments, etc.