Gene Wolfe does it again. I just finished the first book and am working on the second. This is by far the most accessible work of his I've read, but it still has amazing depth.

The book is set in a past that mixes Arthurian, Norse, and traditional Faerie-based mythology. The first-person narrator was a modern boy (probably around 16) who somehow went back to the past, and becomes a knight and a hero. It sounds awfully cheesy, but it's not at all. I'm looking forward to finishing the second book and seeing how it all turns out.