13-year old Thomas Berndorf, the son of the rich business man Alexander Berndorf, becomes friends with Hannes Wille, whose father works as foreman. They get to know each because Hannes sometimes is allowed to polish Berndorf′s Mercedes 300. They make a bet whose mother is the most beautiful. Hannes assumes that Mrs. Berndorf is only admired for her expensive jewellery. Thus, he suggests that Thomas should steal a collier from his mother. Out of solidarity, he also robs a golden brooch from his mother. At home at the Berndorfs, a severe crisis threatens Thomas′s parents′ "marriage of convenience", and financial hardships are following on the theft.