Otto Marle

The Parisian restaurant "At the Oyster King's" is looking for a new waitress, whose job would be to crack open oysters with a newfangled oyster cracker (how exciting!). But who would have thought that this newfound invention would lead to so much turmoil (they're French, aren't they?)?! Through a mix-up, Lilli Dupont gets the job. But Lilli is no waitress, but rather a talented singer, waiting in vain for an engagement. She takes the job and soon every male visitor is laying at her feet. So that Lilli doesn't constantly have to fight off all the horny men, the cashier Aristide spreads the rumor that Lilli is actually the daughter of the millionaire van Muhlen, to whom the "Oyster King" belongs (daughter of a millionaire?!? Oh yes, of course: that will dissuade potential suitors!).

The physician Dr. Deruga is suspected of having poisoned his wife out of greed. She died after naming Deruga, poor and in debt, the sole heir in her will. There are a lot of people willing to testify against him in court, including Marta, the dead woman's best friend. Only his niece Mingo believes him to be innocent and goes out on her own to prove it.