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While Ann and the son of her boss are out on a ship beyond the 12-mile limit, which allows liquor to be consumed, the son, Frank makes unwanted advances towards her. While she is fighting him off, the ship is raided and the passengers herded ashore. Eighteen months later Ann is celebrating her one year anniversary to Lawrence Reagan when her young sister-in-law announces she is in love, and it turns out to be Frank. Ann decides to save her husband's sister from a fate worse than death, and goes to Frank's apartment to prevent an elopement. Lawrence also goes to the apartment that night, and everyone is entangled in a crime of passion.

How to Watch The Locked Door Legally and Safely

If you want to stream The Locked Door 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 The Locked Door 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.