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 protecting egotistical transfer student Orion, Artemis makes a mistake that later provides her with the chance that she has both hoped for and dreaded, to prove her courage to herself and others at Mount Olympus Academy.

"Everyone sees Artemis, goddess of the hunt, as the bravest goddess girl at Mount Olympus Academy. What her classmates and best friends don't realize is that sometimes she isn't as courageous as she seems. And, when Orion--a foreign exchange student from Earth--enters the picture, she is even more nervous than usual! Can Artemis prove to her friends, and herself, that she can live up to her name?"-- Provided by publisher.