Ex-Special Forces operative turned private-eye J.T. Ryan is hired by the FBI to help them thwart a menacing threat to the global economy. Counterfeit currency is turning up in large quantities and is indistinguishable from the real thing. The federal agency has only one lead. Before being killed in Rome, an FBI agent found a name, Sigma. With not much else to go on, Ryan goes to Italy. There he begins to uncover the operation of a secret cabal of industrialists. The shadowy group, known as the Alliance, is bent on dominating the world's currency markets. It appears they are using new, high-tech forging equipment called Sigma. Their plan is to destabilize the U.S. Dollar and the Euro and replace it with their own currency.