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In a little Hungarian university town, at the turn of the century, there exists a small whorehouse. On an ordinary evening, the typical activities of the house include the girls and their madame taking a trip to the legitimate theater to see a play. Their dress and comportment outside the house are exemplary. Then they return and open for business, turning on the obligatory red light. A poor medical student is one of the house's beloved customers whose lack of cash is not an obstacle. One night during a rainstorm, he is encouraged to stay in the house's spare room. In fact, in order to save money from the allowance his mother spares him, they offer him the room as his residence while he continues his studies. When word comes that his mother is visiting, the women decree that she must suspect that nothing is amiss: the house is miraculously transformed into a respectable boarding house. However, it would be best for everyone if the boy's mother could be back on the train and out of town before their regular working hours begin. The student is off for a night on the town, and is unaware of all this. Troubles are compounded when he returns with a drunken crew of town officials looking for their usual entertainment. With the "cat" out of the bag, everyone looks to the mother to see her reaction. Fortunately, she proves not only imperturbable, but warm-hearted. This gentle comedy is based on the short story by Sandor Huyady, "The House With The Red Light."