A modern-day goddess of the moon, Artemis, journeys back to the seat of her immortal power in order to save her father and friends from a power-hungry cult. Summer in New York, but a dark time for Selene: she's lost her home and the man she loves. A cult hungry for ancient power has kidnapped her father and targeted her friends. Now Selene must face the past she's been running from-- a past that stretches back millennia, to when the faithful called...

When the goddess Artemis goes missing, she is believed to have been kidnapped. And now it's up to Percy and his friends to find out what happened. Who is powerful enough to kidnap a goddess? They must find Artemis before the winter solstice, when her influence on the Olympian Council could swing an important vote on the war with the titans. Not only that, but first Percy will have to solve the mystery of a rare monster that Artemis was hunting when...