Family Brandt has lost its fortune in oil speculation, and they have great debts at the local bank. This one is threatened with its own crash due to lack of money. The only hope is Brandt's uncle Thomas Hoffman, an American millionaire, who is coming for a visit. Bank Accountant Schmidt uses his own money to welcome him properly, presenting himself as Brandt's daughter's fiance, but it turns out, that Hoffmann never was a millionaire, in fact he still owns the city of Chicago about $100 for medical treatment. Yet with his existance alone he starts a big scheme to bring back prosperity. Surprisingly it works, yet there are some problems: 1st: Chicago wants the money back, asking at the foreign office in Berlin for help, and 2nd: Hoffmann does not like the sheme at all, and tries to go back to his quiet and peaceful Chicago...