THEY CALLED IT THE KILLING DAY. Twelve people dead, in the space of a few hours. Five murderers: neighbors, relatives, friends. All of them so normal. All of them seemingly harmless. All of them now dead by their own hand . . . except one. And that one has no answers to offer the shattered town. She doesn't even know why she killed—or whether she'll do it again.

Something is waking in the sleepy town of Oleander, Kansas—something dark and hungry that lives in the flat earth and the open sky, in the vengeful hearts of upstanding citizens. As the town begins its descent into blood and madness, five survivors of the killing day are the only ones who can stop Oleander from destroying itself. Jule, the outsider at war with the world. West, the golden boy at war with himself. Daniel, desperate for a different life. Cass, who's not sure she deserves a life at all. Ellie, who believes in sacrifice, who believes in fate, who believes in evil. Ellie, who always goes too far.

They have nothing in common. They have nothing left to lose. And they have no way out. Which means that they have no choice but to stand and fight, to face the darkness in their town—and in themselves.