The Sigma Protocol is the last novel written completely by Robert Ludlum, and was published posthumously. It is the story of the son of a Holocaust survivor who gets entangled in an international conspiracy by industrialists and financiers to take advantage of wartime technology. Plot Ben Hartman is vacationing in Switzerland when he meets his old school buddy Jimmy Cavanaugh - who tries to kill him. As he dodges assassins, mysterious tails, and police while searching for a safe place to hide, he finds his twin brother, Peter, who was thought to have died in an airplane crash several years earlier. Peter describes an international corporation which was formed in the last days of World War II, composed of financiers, influential members of large corporations, and Nazi brass. He gives Ben a photo of some of the leaders, only to find out that their father was a member. Soon, Peter is killed by an assassin, and Ben escapes with his life again. He later meets up with Liesel (Peter's girlfriend). Meanwhile, United States Department of Justice Agent Anna Navarro is recruited by a secretive group within the DoJ to investigate the deaths of a list of influential men around the world who have been dying mysteriously. Her probes turn up false leads, possible coverups, and dead ends, until she finds out that the men have been poisoned by someone using the same obscure toxin. Following the leads, she finds that the men she had been assigned to investigate are part of an international group of financiers and business moguls. She soon finds out that she has been reported "off the reservation", and the attempts begin on her life as well. Through their own distinct investigative means, the two protagonists discover more about the shadowy group, which is called Sigma. It is learned that Sigma has grown from a simple attempt to plunder the Nazi treasury and stabilize the industrial and financial state of the world in the wake of the war, to a political and financial machine which controls as many as 75% of the world's leading companies, and has enough covert political clout to directly influence the outcome of the likes of Presidential elections. Sigma also helped some of the Nazi war criminals, including Nazi doctor Gerhard Lenz, evade capture. Protagonists Hartman and Navarro eventually meet and form an alliance, since both are being hunted by Sigma assassins. Through