Rory Morris isn't thrilled to be moving back to her hometown, even if it's only temporary. But her twin sister, Scarlett, is pregnant, estranged from the baby's father, and needs support, so Rory returns to the place she thought she'd put in her rearview. After a night out at a bar where she runs into an old almost-flame, she hits a large animal with her car. And when she gets out to investigate, she's attacked. Rory survives, miraculously, but life begins to look and feel different. She's unnaturally strong, with an aversion to silver-and suddenly the moon has her in its thrall. She's changing into someone else-something else, maybe even a monster. But does that mean she's putting those close to her in danger? Or is embracing the wildness inside her the key to acceptance?