简介：Potts (George Cole), a British Sanitary Engineer (a plumber in the Colonies), leaves on vacation (holiday in the Empire) with a set of plans for a new secret weapon which he has mistaken for his new plumbing invention. Everyone is hunting for him, including the Russians. The Russkies find him and offer him a job in the Kremlin doing research (on plumbing he believes), he accepts, arrives in Russia and falls in love with Tania, a secret agent. And discovers the true nature of the plans he is carrying.
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