"It's time for the annual Olympic Games, and the four goddessgirls are not happy--especially Artemis. Even though she's better at sports than most of the godboys, she can't compete because rules say the Games are boys-only. No fair! Led by Artemis, Athena, Persphone and Aphrodite, the ladies of Mount Olympus hatch a plan to get Zeus to open up the games to everyone. Will they succeed--or end up watching from the sidelines again?"--Amazon.com.

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.