When demonic cheerleaders invade his high school, Percy Jackson hurries to Camp Half Blood, from whence he and his demigod friends set out on a quest through the Labyrinth, while the war between the Olympians and the evil Titan lord Kronos draws near.

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.

The long-awaited prophecy surrounding Percy Jackson's sixteenth birthday unfolds as he leads an army of young demigods to stop Kronos in his advance on New York City, while the Olympians struggle to contain the rampaging monster, Typhon. --

"Caught in the middle of an ancient power struggle, Emily and Pegasus must venture to Diamond Head volcano in Hawaii to track down the one thing that can save Olympus--before the Titans get there first." --

"With the weakened Titan prisoners hidden on Earth, Astraea, Zephyr, and their team head to Nesso's jungle world to seek help in the struggle against the Mimics. But nothing goes to plan. The moment they arrive, they encounter a world filled with dangers they never imagined possible--from massive, hungry dinosaurs to a blisteringly hot sun. Soon Zephyr and Astraea are seriously wounded. Without ambrosia or nectar to heal them, the group soon realize...

"An ultimatum has been issued: for the Survey Corps to continue the good fight of helping humanity expand beyond the Walls again, they must mount an expedition and prove that the new Vertical Maneuvering Equipment is capable of killing a Titan. But part of the preparation is to actually see the Titans and understand what humanity's greatest foe really looks like-a challenge more daunting than any written test..."--Back cover.