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The Courier is a love story of sorts, with a spy world twist on a well trod Hollywood plot arc: Boy meets boy—in this case British businessman Greville Wynne and Soviet turncoat Oleg Penkovsky—boy loses boy, boy gets boy back again, and then. . . Well, there’s a shocking climax for those unfamiliar with their story.

It begins in 1960, maybe the coldest o…