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Once upon a time, large, beautiful seaside hotels adorned the coast of Øresund – from Bellevue Strandhotel in the south to Hornbæk Badehotel in the north. While the film's director, Stig Lommer, was director of the Hornbæk revues, he was a frequent guest at the bars in these hotels. He loved the glamorous life in this setting and asked Arvid Müller to write a light-hearted "Sommer-Lommer-Spøg" (Summer Joke) about the "deeds of the night" at a seaside hotel. The now defunct Beaulieu (north of Taarbæk) and Marienlyst (in Helsingør) form the backdrop for bandleader Hans Herbert and his pursuit of summer guest Mrs. Winter. This drives the exchange broker to a spontaneous suicide attempt in the middle of a mannequin show. However, he is saved by Mrs. Holgersen, who believes it is for her sake, so she blossoms completely. So much so that she is completely unrecognizable to the manufacturer when he arrives at the hotel.