New England cop turned Las Vegas P.I. Joe Roddick thinks his luck has changed. But when he takes on what seems like an easy location case from the Lucky Hearts Casino his easygoing life explodes.

A professional hitman known as The Scorpion has arrived in Sin City, looking for the same man. After being shot, Roddick realizes he, too, is on someone's hit list. While he recovers, his tech-savvy daughter Kaylee takes revenge into her own hands.

Meanwhile The Scorpion is on the hunt, leaving a mounting body count in his wake. Clearly more than gambling is going on at the Lucky Hearts. Will Roddick be able to expose the operation before The Scorpion silences everyone in his path—including Roddick and Kaylee?