Last Words - the search for AnnaMarie continues - the body of a woman is found in the woods. Luc suspects Mario, AnnaMarie's brother, has something to do with her disappearance but Dörig disagrees.
"Dangerous terrain". Mario is the main suspect in the Susanne Gruber murder case, but the Morgenthalers think it is Willi. Anna-Maria goes on her own search.
"Five minutes of bliss" (aka "Five Minutes of Happiness") - Ayumi kills her tyrannical Japanese father in a hotel room. Dörig chases the truth. Erika and Willi have a blissful breakfast. Anna-Maria tells Mario the name of her father.
"Family Ties" Season 4 finale: A fishmonger is brutally murdered. Mario is a suspect. Anna Maria decides to take on her brother alone. Luc and Fabio refuse to be left behind. Fabio takes a swim. Erika and Willi join all in a holiday party.