The Hollow Sun — D.L. Wainright

Lucy Kincade's biggest concerns in life are her widowed mother, her college apps, and her grades...until she stumbles upon an insidious secret not meant for mortal eyes. When nightmares stalk the waking world and a cannibalistic serial killer is carving a path across America, Lucy and her friends decide to stand against the darkness. But with all the secrets, it's not easy to know whom to trust.