Leaving the safety of the demigod training ground, a disgraced Apollo embarks on a quest across North America to find a dangerous ancient-world Oracle while navigating the challenges of the evil Triumvirate.

Will the Greek god Apollo, cast down to Earth in the pathetic mortal form of a teenager named Lester Papadopoulos, finally regain his place on Mount Olympus? Lester's demigod friends at Camp Jupiter just helped him survive attacks from bloodthirsty ghouls, an evil Roman king and his army of the undead, and the lethal emperors Caligula and Commodus. Now the former god and his demigod master Meg must follow a prophecy uncovered by Ella the harpy. Lester's...

At the conclusion of The Mark of Athena, Annabeth and Percy tumble 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 from both sides and prevent the giants from raising

...

When the goddess Artemis disappears while hunting a rare, ancient monster, a group of her followers joins Percy and his friends in an attempt to find and rescue her before the winter solstice, when her influence is needed to sway the Olympian Council regarding the war with the Titans.

Each of King Neptunes 50 mermaid daughters boasts a special talent, except for little Minnow, who seems to be good only at asking questions. When she finds a strange object, Minnow follows her questions to a wondrous place and finds answers, including the answer to the most important question of all: Who am I? A gorgeously illustrated story about finding one's purpose.

From a smelly watering hole deep in the heart of the Serengeti to the ferocious clamor of the Colosseum, join Julius Zebra and his motley menagerie of friends as they gear up to be gladiators! Only if they win the love of the Roman crowds will they win back their freedom. But do Julius and his pals have what it takes to succeed in a world where only the meanest and toughest survive?