When a Tehrani scientist sends encrypted messages to the CIA about Iran's secret nuclear program, Harry Pappas commences communication with him, positive that his information is legitimate. As the agency looks into pretexts for attacking Iran, the scientist grows certain that his life is in danger. Therefore, Pappas enlists the help of British operatives, the Increment, who possess licenses to kill. As the ordeal grows in complexity, Pappas may have to betray his country to find a resolution.