18+ MATURE CONTENT. Molly Cain has one rule. Men who harm women, deserve no mercy. With Sherif Preston Black at her side, feeding her the names of the city's worst offenders, she turns her thirst for vengeance into a deadly game. But when she requires more of a helping hand, Vesper: a skilled, yet alluring contract killer, is more than willing to step in and Molly finds herself drawn to her for more than just the kill.