How many movies have Herbert Knaup and Stefan Holtz collaborated on?

They have worked on 3 movies together! Their first movie together was Erntedank (2009) while their highest rated movie together was Schutzpatron. Ein Kluftingerkrimi (2016). They have not worked together since Schutzpatron. Ein Kluftingerkrimi (2016). They are most known for their crime films together.