Someone in a prison run by a corrupt warden fakes the deaths of convicts to later use them as expendable assassins. A police officer is sent into the prison to gather evidence of the corruption.
Sewage workers Jack and Charlie get involved in an international Asian gang war when Jack helps the boss of a Shanghai gang against one of his rebellious underlings. This underling then strikes a deal with the Japanese Yakuza in the hopes of toppling his boss and become the leader of Shanghai himself. When the Yakuza assassinate the Shanghai boss, Jack pledges to avenge his new friend's death. As he seeks out those ultimately responsible, he does battle with a variety of ninjas and mercenaries from around the world.
A love story takes place over the course of one evening in Taipei.