The Waking Dark by Robin Wasserman

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They called it the killing day. Twelve people murdered, in the space of a few hours, their killers also all dead by their own hand . . . except one. And that one has no answers to offer the shattered town.
 
Something is waking in the sleepy town of Oleander, Kansassomething dark and hungry that lives in the flat earth and the open sky, in the vengeful hearts of its upstanding citizens. As the town begins a descent into blood and madness, five survivors of the killing day are the only ones who can stop Oleander from destroying itself.
 
They have nothing in common. They have nothing left to lose. And they have no way out. Which means they have no choice but to stand and fight, to face the darkness in their townand in themselves.

"Suspense, chills, gaspsall that and a gem-like writing style that will make you shiver with beauty and horror. A book you won't soon forget." Cassandra Clare, author of the bestselling Mortal Instruments series and Infernal Devices trilogy

"Twisted, pulse-pounding, shocking, and very, very scary. With The Waking Dark, Robin Wasserman conjures vintage Stephen King as she peers into the dark heart of a nightmare America, where violence and evil lurk behind the golden glow of small-town life, and new terrors arrive by the hour. A superb horror story that is by turns visceral and lyrical, heartrending and heart-stopping." Libba Bray, bestselling author of the Gemma Doyle trilogy and the Diviners series