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Ruth van Rydock is worried about her sister's health and well-being and asks their mutual friend Jane Marple to visit her for a awhile. Her sister, Carrie-Louise Serrocold, is married to Lewis Serrocold and he has turned their estate into an institute of sorts for young offenders. Miss Marple is more than happy to visit and finds an odd assortment of characters on the premises. When Christian Gulbranson is found shot while sitting at the typewriter in his room, Miss Marple has a murder to solve. Gulbranson, a trustee of the institute, had only arrived that day on urgent business and Lewis Serrocold found a partly completed letter in his typewriter saying that someone was poisoning Carrie-Louise. Assisting Inspector Slack, with whom she had previously worked, she soon knows who committed the crime but is not quite sure how they did it.

How to Watch Agatha Christie's Miss Marple: They Do It with Mirrors Legally and Safely

If you want to stream Agatha Christie's Miss Marple: They Do It with Mirrors through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Agatha Christie's Miss Marple: They Do It with Mirrors films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.