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.

While the Olympians struggle to contain the rampaging monster Typhon, Kronos begins his advance on New York City, where Mount Olympus stands virtually unguarded. Now it's up to Percy Jackson and an army of young demigods to stop the Lord of Time.

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.

"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." --

"When Titans Astraea and Zephyr find a human boy on their world, they must figure out how he got there and why. What they uncover is a plot to take over Titus and ultimately the universe" -- Provided by publisher.

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...