“Hyena”即是鬣狗，一种普遍群体性觅食、依靠腐肉为生的动物。电影中的“Hyena”，伦敦警察迈克尔·兰度（Peter Ferdinando）领导着一只由马丁（Neil Maskell），凯斯（Tony Pitts）和克里斯（Gordon Brown）组成的四人小队。穿梭在底层伦敦各式各样的贩毒场所，他们最主要的“工作”是找到愿意合作的毒贩，从中获取非法利益。Michael Logan is a police detective in London. His area is drugs and this brings him into contact with European drug syndicates. Logan is happy to turn a blind eye to their dealings, for a cut, or confiscate suppliers' merchandise for their own profit. So far he and his equally-crooked police colleagues have done quite well out of this. Then a deal he was planning with a member of a Turkish drug cartel goes sour and the balance of power swings to an Albanian gang, run by two brothers, the Kabashis. Logan quickly aims to provide the Albanians with the same service he provided the Turks, but they aren't easily lead. Meanwhile, he an his colleagues are being investigated by Internal Affairs. Just to make his life more complicated, he has been seconded to a vice task force, run by a former colleague whom he does not get along with.