Commissioner Brockmann's criminal investigation is prompted by the body found by the cleaner Erna Pieper, which turns out to be very mobile! She disappears and reappears, causing considerable confusion among the survivors. The inspector and the cleaner get into a fierce competition to solve the case. The expert and the naively clever dilettante engage in a veritable battle of applied detective story logic. Which professionally proud expert likes it when a "little woman from the street" keeps messing up his work with her uneducated, "common sense" - and is successful at the same time...

A big change is on the horizon in a small northern German community. The local council agrees that the village needs a doctor, a properly qualified doctor of medicine. But where to put the doctor and practice? There is only one option: The house of midwife Mathilde Jansen, which belongs to the municipality. Midwives are becoming unfashionable anyway. Although she is forced to vacate her home as a result of the change that has been decided, the midwife goes along with it. Mathilde herself gets involved in the search for a doctor. The local council is soon in for a rude awakening. Midwife Jansen, known as "Mother Griepsch" in the old North German dialect, has all too wilfully bungled the local politicians.

The Knüppels are in trouble with their underage daughter, who has discovered love too early. She has a child with Frank Dreier. But the young people have long since come to an agreement.