How many movies have Klas Engström and Lasse Westfelt collaborated on?

They have worked on 10 movies together! Their first movie together was Pillertrillaren (1994) while their highest rated movie together was Beck - Spår i mörker (1998). They have not worked together since Beck 15 - Pojken i glaskulan (2002). They are most known for their mystery films together.