Percy, expelled from six schools for being unable to control his temper, learns the truth from his mother that his father is the Greek god Poseidon, and is sent to camp Half Blood where he is befriended a satyr and the demigod daughter of Athena who join him in a journey to the Underworld to retrieve Zeus's lightning bolt and prevent a catastrophic war

"Jason has a problem. He doesn't remember anythign before waking up in a bus full of kids on a field trip. Apparently, he has a girlfriend named Piper, and his best friend is a guy named Leo. They're all students at the Wilderness School, a boarding school for "bad kids," as Leo puts it. What did Jason do to end up here? And where is here, exactly? jason doesn't know anything - except that everything seems very wrong. Piper has a secret. Her father,...

Annabeth and Percy have tumbled into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy's instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea's forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors both sides and prevent the giants from raising Gaea. But, Leo wonders, if the Doors...

Despite their best efforts, Carter and Sadie Kane can't seem to keep Apophis, the chaos snake, down. Their only hope: find an ancient spell that might turn the serpent's own shadow into a weapon.

Brilliant Egyptologist Dr. Julius Kane accidentally unleashes the Egyptian god Set, who banishes the doctor to oblivion and forces his two children to embark on a dangerous journey, bringing them closer to the truth about their family and its links to a secret order that has existed since the time of the pharaohs.

Carter Kane and his sister must prevent the chaos snake Apophis from breaking free in a few days' time or the world will come to an end. To have any chance of battling these Forces of Chaos, the Kanes must revive the sun god Ra.