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The younger brother of the consulting detective tries to steal Sherlock’s glory by solving an important case assisted by an eccentric Scotland Yard detective and a lovely but suspicious actress.

How to Watch The Adventure of Sherlock Holmes' Smarter Brother Legally and Safely

If you want to stream The Adventure of Sherlock Holmes' Smarter Brother 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 Adventure of Sherlock Holmes' Smarter Brother 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.