A friend of Miss Marple claims to have seen a murder committed on a passing train, but the police dismiss it, as no body has been found in the train or surrounding area, so the two women begin an investigation of their own.
A friend of Miss Marple claims to have seen a murder committed on a passing train, but the police dismiss it, as no body has been found in the train or surrounding area, so the two women begin an investigation of their own.