 Agent No 326 is ordered to stop a spy-ring, but he falls in love with one of the spies, Sonja. No 326 tries to find the head of that organisation. He doesn t know that this is banker Haghi, with whom Sonja bets, that No 326 will identify him, because she has fallen in love, too. So haghi tries everything to confuse the secret service and to neutralize No 326.