Christel and Christoph have no education, no morals - they are working as servants in wealthy homes in order to clean out their hosts. Having decided to combine their talents and efforts, they are starting to work in the the house of Therions - wealthy bourgeoisie of Mulhouse...

Two babies are switched at birth. When the mistake is discovered 12 years later, it leads to complications in the lives of both families. One family is affluent, with dutiful and (apparently) contented children. The other family is poor, with rambunctious (even delinquent) children, often hungry, but with lots of laughter in the house.