Harley Quinn teams up with an unlikely crew—a pop star, a deadly assassin, and a gritty police detective—after a young girl steals a precious diamond from a ruthless crime lord, placing a dangerous hit on her life. As they navigate the chaotic world of crime and deception, the team must outsmart both the mob and the authorities to protect the girl and survive the deadly consequences of their actions. With chaos and humor at every turn, Harley leads the charge, determined to keep her new friends safe while taking down anyone who stands in their way.