New divorcée Christine wants to spend her vacation "with the girls" on a North Sea Island. With her friend Dorothea, she wants to lend a hand to Marleen, who runs a pension there and wants to renovate. To her horror, Christine's mother forces her to take her father Heinz along. Heinz not only turns brings chaos to the pension, but also suspects the charming guest Johann – whom Christine has fallen in love with – of being a wanted marriage swindler.