How many movies have Christian Obermaier and Frank Schreiner collaborated on?

They have worked on 4 movies together! Their first movie together was Das Zimmermädchen und der Millionär (2004) while their highest rated movie together was Mein Mörder kommt zurück (2007). They have not worked together since Lilys Geheimnis (2009). They are most known for their tv movie films together.