Charlie, forced to reevaluate her all-female mechanic shop, unknowingly confides in her online confidant Beau, who turns out to be her real-life business rival, their connection blossoms amidst professional rivalry.
Charlie, a notorious serial killer known as the Midnight Mangler finds himself trapped, reliving the same violent night over and over. Initially embracing his grisly urges, Charlie soon becomes desperate to escape the endless nightmare.