Agatha Christie's Marple

They Do It with Mirrors (4x3)

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Carrie-Louise and her third husband Lewis Serrocold run a correctional facility for young men on their estate, Stonygates, where they also house a rag-tag of family and step-family. After a fire tears through Carrie Louise's office, her sister, Ruth Van Rydock, urges their old - and somewhat less glamorous - friend, Miss Marple (Julia McKenzie), to visit the blithely unsuspecting philanthropist.