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Xavier Lombard is a world-weary private eye in London, in exile from his native Paris; his best friend is Nathalie, a high-class call girl. He gets a call from an old friend from the Paris police department, now a businessman whose brother-in-law is missing. The missing man's parents hire Xavier over their daughter's objections, and quickly he finds himself in the realm of children's sexual slavery. He guesses that the lost son is dead and shifts his focus to finding and breaking this lucrative business of child trafficking. He involves a reluctant Nathalie to hunt "the Austrian," the shadowy head of the business. Violence erupts quickly, and Xavier soon has little more to lose.

How to Watch The Lost Son Legally and Safely

If you want to stream The Lost Son 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 Lost Son 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.