A cryptic warning at a traveling fair foreshadows a brutal attack that shatters a small farming community. Sixteen-year-old Delah Nix dismisses a soothsayer's prophecy of impending evil, but the subsequent savage murder of her sister forces her to confront the possibility of the supernatural. As authorities pursue conventional suspects, Delah's investigation deepens when a friend, bitten while trying to save her sister, begins exhibiting strange powers and a predatory hunger. Delah races against the approaching full moon to find a cure for her friend, fearing he will succumb to his new nature and become a danger to himself and the girl they both love.

The premise sets up a compelling blend of small-town horror and supernatural mystery, focusing on a young protagonist grappling with grief and the unsettling transformation of a close friend. The narrative appears to explore themes of loyalty, the unknown, and the difficult choices one must make when faced with monstrous change. The approaching full moon and the potential for a tragic confrontation suggest a tense and emotionally charged climax. The story's focus on a teenage protagonist and supernatural elements strongly indicates it will resonate with a young adult audience.