This time, Harley Quinn joins forces with a singer, an assassin and a police detective to protect a young girl.The girl was put on a reward order for stealing a rare diamond from a cold-blooded criminal leader, and her life was in extreme danger. Halle has always been crazy and unruly, but this mission made her feel a little soft.Faced with the tears and fear of the innocent girl, she wandered between chaos and redemption for the first time.This is not only a life-and-death battle, but also a journey of trust, courage and redemption.They must work together to open up a way for hope in the shadow of sin.