If you loved Secret Agent, try Vertigo
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Alfred Hitchcock, and they both carry the paranoid, slow burn mood tags, and they sit in Mystery / Romance / Thriller territory. If that's the register that drew you to Secret Agent, the second film will land in a comparable space — through a different lens.
paranoidslow burn
What Vertigo is
San Francisco, foggy nights, a steep staircase. A retired detective trails a woman in a green dress, his fear of heights lurking. Hitchcock frames obsession.
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