Former CIA Agent George Mueller arrives in Havana in August 1958--the last months before the fall of Cuban dictator Fulgencio Batista--to look into the activities of Toby Graham, a CIA officer suspected of harboring sympathies for the rebel forces fighting the unpopular Batista regime. Mueller knew Graham as an undergraduate and later they were colleagues in Berlin fighting the Soviet NKVD. Under the guise of their long acquaintance Mueller is recruited to vet rumors that Graham is putting weapons, covertly provided by the CIA to Batista, into the hands of Castro's forces. Public exposure of the CIA weapons mission, and the activity of one rogue agent, threaten to embarrass the agency. Mueller uncovers a world of deceit as the FBI, CIA, and State Department compete to influence the outcome of the revolution in the face of the brutal dictatorship's imminent collapse. Graham, meanwhile, is troubled by the hypocrisy of a bankrupt US foreign policy, and has fallen in love with a married American woman, Liz Malone.