A torrent of counterfeit money is flooding into the United States, creating panic in financial markets and threatening to crash the global economy. The fake currency is so perfect that it's indistinguishable from real dollars. The FBI and the Secret Service set up a joint task force to hunt down the criminals behind the counterfeiting plot. Heading up the investigation is John (J.T.) Ryan and Erin Welch. The federal agencies have only one lead. Before being murdered 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 a secret cabal of criminals. The shadowy group, known as the Alliance, is determined to dominate the world's currency markets. And the conspiracy will stop at nothing, including murder, to accomplish their goal. Using high-tech forgery equipment called Sigma, they aim to destabilize the U.S. Dollar and the Euro and replace it with their own currency. Barely surviving several attempts on their lives, Ryan and Erin sift through a harrowing maze of death and deception, as they follow the leads from Rome to Mexico City, and then to Moscow. When they uncover the final layer of the conspiracy, they realize the shocking truth: the real power behind the Alliance is in Washington D.C. Can Ryan and Erin blow the lid off the conspiracy before the global economy collapses?