Inspector Lee (Danny Lee) and his team (including Monica Chan and Cheung Kwok-Keung) look into the mysterious disappearance of a seedy loan shark (Ken Lo), but find no real leads. Amazingly, the culprits fall into their laps. Four young men, led by Wong Wing-Man (Sam Lee) confess to the killing. Apparently, they were deep in debt, and found the murder of their friend to be the only way out. There is one problem, though: no physical evidence.

Five cops work and get on each other's nerves during a hot summer. Tak is a gambler, too much so for his girlfriend to risk marriage. Daddy, a single father, is harsh with his son who reminds him of the woman who abandoned them. Monk is mercurial, talkative, a show-off. Kong, a steady family man, keeps the peace. Sam is new, hoping to fit in and make it as a cop. Three brutal and murderous robbers are on the loose, and so is a former soldier, embittered over the loss of his pension, using very real bombs to extort what's due him. It's a dangerous job, and the cops must watch each other's back, regardless of their personal problems.