In this actioner, one of a pair of imprisoned Vietnam veterans escapes and forms an organization of secret ninjas.

In his attempt to be the most powerful man in the world, Justin Taylor, leader of a sinister Ninja army, has become the largest narcotics smuggler in the orient. The U.S. Drug Enforcement Agency and the Hong Kong Police have joined forces with the CIA and a brilliant policewoman, the awesome Amazonia, to bring down Taylor by any means, at any cost. The CIA operative chosen for the task ultimately realizes that the man he must kill was his closest friend in the war. Torn between justice and loyalty he's got to make the most crucial decision of his life.

The Black Ninja Empire want a "confidential blueprint" in the possession of Vietnam vet Robin and will stop at nothing to get it. When Robin's fiancée is murdered, her sister joins the White Ninja Empire and teams up with Robin to wreak bloody vengeance.