Last year, The Prometheus Deception was published to glowing reviews and enthusiastic reader response, and spent over two months on The New York Times bestseller list, proving that Ludlum is the master of the international thriller. Now, with The Sigma Protocol, Ludlum raises the stakes yet again. American investment banker Ben Hartmanson of the legendary Max Hartman, who built a financial empire from less than nothingis on a vacation in Switzerland when he is approached by a childhood friend, who promptly tries to kill him. Narrowly surviving, Ben discovers that the body of his former friendas well as all evidence of the confrontationhas disappeared. But the attempts against his life are just beginning. Anna Navarro, a U.S. government agent, is sent to surreptitiously look into a string of deaths and murders of old men around the world. The only thing the men have in common is an OSS file marked with the code word Sigma. Brought together by accident, Hartman and Navarro must uncover the secrets long buried under the name Sigmatruths that threaten everything they think they know about themselves, their families, and even history itself. Not only are their lives and the lives of everyone they hold dear at stake, but so is the very future of the world.