SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk!
Set in the 1960s, ‘The Courier’ is a historical drama film that chronicles the life of a working-class British businessman, Greville Wynne, who catches the eye of the MI6 and the CIA while traveling frequently through Eastern Europe on work trips. Soon, the intelligence agency recruits him on a secret mission to avert the Cuban Missile Crisis. At the behest of the agencies, he meets with Soviet comrade, Oleg Penkovsky, and over multiple trips to Moscow, Greville smuggles Soviet intelligence concerning the missiles to prevent the cold-war from escalating.
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https://www.thecinemaholic.com/the-courier-is-based-on-two-unsung-heroes/