Persephone & the Evil King (Little Goddess Girls, Bk. 6, QUIX)

Athena, Oliver, and the queen have been captured by evil King Hephaestus! Persephone isn't sure how she can help - she is the only one in the group without a special object. But when the king tells everyone he has hidden Athena, Oliver, and the queen in his huge treasure room, can Persephone use her good luck in order to save her friends.