On a quiet night, Cynthia Sheyer and her friends stumble upon their parents' gruesome murders. The notorious killer, Mason Bayer, meets his match when they fight back. Eighteen years later, the group finds they've suddenly taken on traits of the killer known for numbering his victims in backward English. One by one, they turn their backs on each other when they discover their biggest threat is themselves, and the only way to ensure their safety is to kill one another. Though the killer has been dead for nearly two decades, he lives within them, and it is clear he has a job to finish; a victim to number NEVES.