Although Greta Garbo takes top billing here - and she's great - I think this film really belongs to the on-form Melvyn Douglas as the scheming "Leon". He is the boyfriend of the Imperial Grand Duchess "Swana" (Ina Claire) who is living in exile in Paris. The newly formed Soviet Union is a bit broke, so three of it's finest representatives have arrived with what was her priceless jewellery so they can sell it on. "Leon" sees a chance for them to cash in so gets an injunction stalling the sale and that results in Moscow sending their best agent (Garbo) to get the job done. She's a no-nonsense…