Three delinquent police cadets are recruited to pose as underworld types to investigate the theft of rocket fuel which can be used as a powerful explosive - a theft seemingly connected with a spate of gangland killings. They uncover a feud between Japanese criminals and a (fulfilled) plot to blow up the HK Convention Centre. This relatively big budget action-comedy offers little more than a series of set pieces (gunfights, sky dives, car chases, etc), individually well enough staged but cumulatively boring. The biggest problem is the shapeless, witless script; minor pleasures include vivid supporting turns from Tsang, Ng and newcomer Wu. A US major has picked up international rights, presumably because of Jackie Chan's cameo in the final reel.