Lina Braake, an 81-year-old lady, has to leave her flat when the flat is inherited by a bank. She has to go to a home for old people. There she meets a former business man, an old fox who officially has been declared incapacitated. Nevertheless, he is involved into several financial transactions, some of them not exactly legal, because he cannot be indicted. He teaches Mrs Braake several tricks of the trade, and develops a scheme to frame the bank who has driven her out of her flat.