Ernst is a curious little boy. He is five years old and lives downtown in a smallflat with his beloved mother. She is always on the look-out for a new boyfriend and never lets a flirt pass her by.
This gives Ernst a lot of freedom and he is the one who takes over whenever his mother has got other things on her mind. Ernst is pretty good at making things worse and getting himself into trouble, but luckily everything always turns out well in the end.