Divided Allegiance - Elizabeth Moon
Oath of Gold - Elizabeth Moon
Game of Thrones - George R.R. Martin
The Lightning Thief - Rick Riordan*
The Sea of Monsters - Rick Riordan
The Titan's Curse - Rick Riordan
The Battle of the Labyrinth - Rick Riordan
The Last Olympian - Rick Riordan

* Reread.