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Potts (George Cole), a British sanitary engineer, leaves on holiday 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 who 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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