Meet Cordelia Black. Cordelia loves exactly three things: her chosen family composed of her best friend Diane and her goddaughter; her hairdresser (worth every penny plus tip); and killing bad men. By day she's a successful pharmaceutical rep with a pristine reputation and a designer wardrobe. By night she's culling South Louisiana of unscrupulous men—monsters who always seem to evade justice, until they meet her. It's a complicated yet fulfilling life that requires complete and total control at all times. But when the evening news starts throwing around the words "serial killer," pressure heightens for her in the South, and it's only exacerbated when Diane starts dating a man Cordelia isn't sure is a good person—someone who might unravel everything Cordelia has worked for. Soon Cordelia's world spirals, and she loses her grip on those tightly held threads that keep her safe.