If you loved M, try The Big Heat
A bridge between a film you've already seen and one most people haven't. The Big Heat has roughly 4.5× fewer votes than M — it's a deeper cut, not a mainstream recommendation. 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 Fritz Lang, and they sit in Crime / Thriller territory. If that's the register that drew you to M, the second film will land in a comparable space — through a different lens.
What The Big Heat is
Rainy city streets at night, a pistol lies on wet pavement, a cryptic death sparks a lone detective's crusade, Fritz Lang's noir era shines through.

