Overall: Very creative story: based on that if the Greek gods and godess's are real.
Lightning thief: Opens the gate to the fascinating story; reveals the antagonist
Sea of Monsters & Titan's Curse: Flame of battle is igniting; continues to introduce the Greek gods
Battle of Labyrinth: Fully describes the image of dark, spooky labyrinth
Last Olympian: In the small city of New York, Riordan specificly describes the battle in a short amount of pages.