There is no real plot in this little short which was made only as a wedding present for Lord and Lady Mountbatten. The main plot line is that Lady Mountbatten has a valuable pearl necklace, which a very large number of crooks wants to steal.
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It is what it says in the full title - a home movie, interesting because Chaplin seems to have whipped this up for visiting royalty. Wonder what the modern equivalent of this would be. Richard Branson getting a selfy with some mega pop star?