Charles Korvin is Maurice Leblanc's master criminal. He steals Rembrandts and Oriental ceramics, and Ella Raines' heart, but not the fabulous emerald she owns, because when a man with a cleft in his chin that deep meets Miss Raines, c'est l'amour! J. Carroll Naish is an amusingly bumbling Ganimard, the fellow from the Surete who's an expert on everything Lupin except how to catch him. And Gale Sondergaard and Miles Mander are on hand as Miss Raines' auntie and uncle, the real villains of the piece.
It's a very light-hearted example of Lupin, created by Lablanc as an anti-Sherlock Holmes. Indeed, in his second set of adventures, he dealt with Holmes -- sometimes with 'Herlock Sholmes' -- with Gallic contempt. It's quite amusing and promises more adventures, but alas, this was the last time an American studio tried their hand at the character. He still turns up occasionally in France, the Philippines, and Japan.