Set against a Hong Kong that never sleeps, a stolen police gun triggers a suspenseful chain of events. Tracking down his missing gun before dawn, Sergeant Lo first has his car vandalised and is then beaten up. Suddenly he finds himself edged between two gangs on the brink of a bloodbath, whilst at the same time staving off investigations by both Vice Squad and Homicide Units embroiled in their own turf war. His only lifeline is a maverick Police Tatical Unit squad who have one night to help him find his gun.