Robert Ludlum

Medical researcher and sometime spy, Lt. Col. Jonathan Smith, and two colleagues face a plot to unleash a deadly disease on an unsuspecting populace.

When a childhood friend unexpectedly attempts to murder him in Switzerland, an American investment banker begins to unravel a mystery involving his famous financier father and a mysterious OSS case code-named Sigma.

Nicholas Bryson, a former operative for the American secret intelligence group the Directorate, is forced to rely on his rusty skills and unreliable contacts for help when he is recruited years after his retirement by the CIA to infiltrate the group which Bryson has just learned was working against the best interests of the country.