Murder with Mirrors is a 1985 TV movie based on the Dame Agatha Christie mystery novel, They Do It with Mirrors. The film is set in a youth detention centre run by a charitable American educationalist in England.

It stars Helen Hayes as Miss Marple and Bette Davis as her old American friend from their days touring Italy as young ladies. Miss Marple is called on to investigate possible causes of her friend's deteriorating health. However, as Miss Marple keeps her friend company, her attention is soon diverted as she stumbles over a dead body. A murderer is at large in a house of suspects, and a race against time begins. The film marks Helen Hayes' last appearance as Miss Marple; indeed, it was her last film role. There is a more recent dramatisation with Joan Hickson as Miss Marple, adopting the title of the novel "They Do It With Mirrors".

It also stars John Mills, Leo McKern and Dorothy Tutin

At IMDb http://www.imdb.com/title/tt0089640/

Christian Gilbranson, Miss Marple's lawyer, persuades her to visit the baronial estate of his step-mother, Carrie Louise Serrocold, an old friend of Marple's. Carrie Louise's devoted husband Lewis has turned the manor house into a halfway house for young men with criminal records and has hopes of expanding the facilities. He confides to Miss Marple that he suspects that someone is slowly poisoning Carrie Louise with arsenic. One of the young charges, Edgar Lawson, claims to be Lewis' illegitimate child and wants his alleged father to acknowledge him. While they are arguing behind closed doors a gun is discharged, and the visiting Gilbranson is found murdered in another room. It is up to Miss Marple to aid crusty Inspector Curry discover the murderer's and poisoner's identities. Written by Gabe Taverney (duke1029@aol.com)

Miss Marple is asked by her lawyer, Christian Gilbranson, to visit his step-mother, Carrie Louise Serrocold, an old friend of Miss Marple's, at her country estate. Carrie's husband, Lewis, confides to Miss Marple that he suspects someone is slowly poisoning his wife, and when Gilbranson visits the mansion, he is mysteriously murdered. Written by Gabe Taverney (duke1029@aol.com)