How many movies have Agatha Christie and Barbara Hicks collaborated on?

They have worked on 4 movies together! Their first movie together was Death on the Nile (1978) while their highest rated movie together was Miss Marple: The Mirror Crack'd from Side to Side (1992). They have not worked together since Miss Marple: The Mirror Crack'd from Side to Side (1992). They are most known for their mystery films together.