There is a city where all organised crime is run by one of two gangs. The two gang bosses each have a tall high-rise building, over the road from each other. Their penthouse suites face towards each other and they often glare across the road, trying to outsmart and out-plot each other.
Into this mix comes a young man. He starts at the bottom of the organisation and quickly works his way up the ranks. Unbeknownst to the bosses, he's actually working for both gangs at the same time, but he quickly becomes the right-hand-man in both. He offers ways to break the stalemate, finally defeating each mobster's nemesis.
However, the film ends with him in the office of one mafioso, with both bosses tied to chairs. We learn that actually his goal the whole time has been to avenge his family, killed by one or other of the gangs after his father got into gambling debt. He kills both gang bosses by taping plastic bags around their heads.