Murder, She Said (1961)

While passing by on a different train, Miss Marple witnesses the strangling of a young woman in the opposite carriage. The local police dismiss her story as the ramblings of a senile and bored old woman, so, undaunted, she conducts her own investigation, and comes to the conclusion that the body must be buried on the grounds of Ackenthorpe Hall, which adjoins the railway line.

Wheedling her way into a job as housemaid there, Marple copes with the pompous machinations of her difficult employer, Luther Ackenthorpe (James Robertson Justice), so she can search for the mysterious corpse, and eventually finds it while supposedly practicing her golf shots.

As she begins collecting suspects, accompanied by her long suffering companion Jim Stringer (Stringer Davis), Miss Marple finds herself faced with an increasingly devious and resourceful killer, who begins casting his shadow over Ackenthorpe's heirs...