Det var paa Rundetaarn.

It all begins innocently enough on a summer Sunday morning, with the sun shining from a cloudless sky. Mrs. Hald sends her two young twenty-year-old daughters on a cycling and swimming trip to North Zealand. Mr. Hartsen, a district court attorney who, incidentally, is married to a very jealous and combative wife, is taking his newly acquired Chevrolet for a long drive. When the two girls have everything stolen from them while swimming in the sea, they stop the first motorist they meet—and unfortunately, this happens to be our friend, district court attorney Hartsen.