City of Darkness

Yen plays a seasoned cop reluctant to return to the fray, but as a big brother figure, he comes to the assist of his friend Pen, a troubled cop still on the force. Much of the plot involves a power-hungry, vicious, and greedy villain named Duan Mu who wants possession of a legendary treasure and will do anything to get it; Duan Mu has a crooked cop, Pen’s superior, in his pocket to assist. Two misfits and a brother and sister discover they are not only sharing the pieces of a jade necklace, but a father, and their necklace is the key to the treasure