Mattes responds to an entering alarm call and catches the apparent robber, housekeeper Maren Heinemann who ran into the garden, while his cop partner Melanie finds shivering under his bed the charming young owner, orphan Fabian Westphal, an engineering student until a diving accident left him mentally reduced to childhood. Both deny she stole the missing Celtic gold he inherited from his father's collection, she spent the night as Fabian's lover. Fabian's court-appointed guardian Karin Berger and especially uncle Burkhard Breiholdt, who was diving with him, fear Maren is simply after gullible Fabian's fortune. Frustrated that nobody takes his feelings seriously, Fabian takes an excessive risk landing him in hospital, but as ever more fussy young father Tarik helps with theories, everyone's part is cleared up.
—KGF Vissers