Moon Demon is the seventh book in the Daughters of the Moon series written by Lynne Ewing. This young adult fantasy series follows a group of teenage girls who are reincarnated goddesses with special powers. In Moon Demon, the focus is on Serena, one of the Daughters of the Moon. Serena is a high school student who possesses the power to control water. She is also the leader of the group and is responsible for protecting her fellow Daughters from the evil Atrox, an ancient force that seeks to destroy them. Daughters of the Moon: Moon Demon is a thrilling and suspenseful addition to the series, filled with supernatural elements, romance, and the ongoing battle between good and evil. It explores themes of identity, self-discovery, and the power of friendship.