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Stephen Whittaker loosely based his Rocket Post -- a romantic period drama leavened with quirky humor -- on the life and experiences of German rocket scientist Gerhard Zucher. The film opens circa 1938 in Southern England, where two expatriate aerospace engineers, Gerhard Zucher (Ulrich Thomsen) and Heinz Dombrowsky (Eddie Marsan), are attempting to use rockets as rapid-fire transports for regular postal mail. A regulating British official decides to assign both men to the Scottish isle of Scarp, where they can conduct rocket experiments sans interference. Personal complications arise, however, when Gerhard falls in love with local Scottish woman Catherine MacKay (Shauna MacDonald) -- and she with him. They enjoy a sweet, gentle, funny romance, and as Gerhard breaches success with his experiments, he finds his spirits lifted by the vicissitudes of Scottish life. But events take a decidedly darker turn when the Nazis show up and demand that Zucher return to Germany; if he refuses, his sister and her children will be executed. Suddenly, Zucher finds himself torn between his undying love for Catherine and his familial loyalty.