The Lone Wolf in Paris

Francis Lederer is the Lone Wolf, retired jewel thief and a bit bored by it. He's staying at a hotel in paris, where various foreign nobles report that their suites have been robbed -- raising the manager's suspicions of Lederer -- of nothing. Lederer discovers that Princess Frances Drake of Made-Uppia is present, trying to recover the crown jewels necessary for her brother's coronation; their mother, Ruth Robinson, borrowed money on them, but now the lenders, led by Grand Duke Walter Kingsford, refuses to let her redeem them; he plans to run the country when the jewels in the crown turn out to be paste. So Lederer offers to help the Princess out.

Lederer plays the role with aplomb, considerably more than all the dukes and royals combined. His tricks are simple and invariably succeed, until the bad guys point guns at him. It's a nice little adventure movie that gets it over in 66 minutes, and then you can get on with something else.