The complete Percy Jackson and the Olympians Series By Rick Riordan. Series #1 Percy Jackson & the Olympians:The Lightning Thief - Follow Percy's mythic adventures as he travels from this world to the Underworld to Mount Olympus in a heart-pounding modern odyssey that was a #1 New York Times bestseller. Series #2 The Sea of Monsters - In this highly anticipated sequel to The Lightning Thief, a magical tree protecting the borders of Camp Half-Blood is poisoned. Series #3 The Titan's Curse - Hilarious and action-packed, this third adventure in the series that started with The Lightning Thief finds Percy faced with his most dangerous challenge so far: the chilling prophecy of the Titan's curse. Series #4 The Battle of the Labyrinth - Percy Jackson isn't expecting freshman orientation to be any fun. But when a mysterious mortal acquaintance appears on campus, followed by demon cheerleaders, things quickly move from bad to worse. Series #5 The Last Olympian - All year the half-bloods have been preparing for battle against the Titans, knowing the odds of a victory are grim. Kronos's army is stronger than ever, and with every god and half-blood he recruits, the evil Titan's power only grows.