Viper Moon (Earth Witches, #1)

Cassandra Archer is the Huntress. She has faithfully served the Earth Mother for years, rescuing kidnapped children from monsters-both human and supernatural-dwelling in the ruins of the Barrows District. But when two children are kidnapped under similar circumstances, all clues point to a cataclysmic event on the next dark moon. Now Cass must race against the clock and prevent a sacrifice that could destroy the entire town...