How many movies have Dieter Stempnierwsky and Ralph Thiekötter collaborated on?

They have worked on 3 movies together! Their first movie together was The Three Investigators and The Secret Of Skeleton Island (2007) while their highest rated movie together was The Three Investigators and the Secret of Terror Castle (2009). They have not worked together since Night Train to Lisbon (2013). They are most known for their mystery films together.