The good assassin : a novel
(Book)

August 1958: former CIA agent George Mueller arrives in Cuba's volatile capital, where he has been assigned to monitor the CIA's "man in Havana" and possible traitor, none other than his old friend Toby Graham. Under the guise of their brotherly affection, Mueller is recruited to vet rumors that Graham is putting weapons, covertly provided by the CIA to the unpopular Batista regime, in the hands of Castro's forces. It is up to Mueller to distinguish whether Graham's rebel sympatheties are true and, if they are, how deep his loyalties to his old friend lie...