Vacation in Mauritius! Frank Kowalski simply treats himself to one with his wife Sandy and son Jochen. When the Ossi happens to save the blasé Renate von Zangenheim from a purse snatcher, her husband Hubertus wants to return the favor with a dinner. But the subsequent trip on the Protzwessis' yacht ends fatally in a fiasco. Shipwrecked, both families end up stranded on an uninhabited island...