Percy Jackson And The Olympians:
Book 1: The Lightning Thief
Book 2: The Sea Of Monsters
Book 3: The Titan's Curse
Book 4: The Battle Of The Labyrinth
Book 5: The Last Olympian (My most favorite book ever)
And the second series
The Heroes Of Olympus:
Book 1: The Last Hero
Book 2: Son Of Neptune...