Carlo Petelin and Katja booked a honeymoon cruise, accompanied by her spinster sister Mia, to his native Montenegro, but his grand surprise isn't to her feminist taste. Jens and Luise Muller plan to be wed aboard, but wedding planner Andrea broke a leg, so her Partner Stefan Herbst must organize it alone, while his mother Friederike booked as a surprise and smuggled in her dog, which gives doc an allergy, and her first love was Montenegrin Petko. Jen's brother Magnus learns only now that the bride is adoptive son Marius's biological mother.