Both leads give performances that go beyond their usual range in a satire that’s sometimes diverting but ultimately toothless. Entertainment veteran Shirley Yung, who directs, should know better

Sent into a drunken tailspin when his entire unit is killed by a gang of thrill-seeking punks, disgraced Hong Kong police inspector Wing (Jackie Chan) needs help from his new rookie partner, with a troubled past of his own, to climb out of the bottle and track down the gang and its ruthless leader.