A child's body has been found, drained of blood, after the eve of a Blood Moon. Assigned to find the killer, police detectives Bartholomew Jones and Helen Martin first uncover a secret which destroys Jones' marriage. Then they discover a secret cult of sanguinarians whose thirst for adrenochrome-rich blood has claimed victims in several neighboring communities. As a new Blood Moon approaches, Jones and Martin hurry to identify the cult leaders and save an unknown potential victim. Who is the cult's Archdruid? Who is its next intended victim? Can the bloody ceremony be stopped in time?