How many movies have Gregor Arnold and Henning Baum collaborated on?

They have worked on 3 movies together! Their first movie together was 21 Liebesbriefe (2004) while their highest rated movie together was Mord in aller Unschuld (2008). They have not worked together since Mord in aller Unschuld (2008). They are most known for their tv movie films together.