How many movies have Håkan Nesser and Katharina M. Trebitsch collaborated on?

They have worked on 2 movies together! Their first movie together was Inspektor Barbarotti - Mensch ohne Hund (2010) while their highest rated movie together was Inspektor Barbarotti - Verachtung (2011). They have not worked together since Inspektor Barbarotti - Verachtung (2011).