"Mystery movies are nice and easy to define. They're movies that put some kind of mystery central, on a narrative front, and they often keep the viewer in the dark for long stretches. These sorts of stories have their fair share of misdirection, plot twists, and reveals, and, when done well, they can make viewer confusion feel like a feature rather than a bug. Films that belong to the mystery genre also benefit from being rewatched, as you can approach the story again and fully understand how you might've been tricked the first time around. Also, such movies are easy to spoil, but that won't happen below. Even though some of these mystery movies from the last 75 years are very well known, none of the commentary will ruin any surprises. Further, some of these fit within other genres too, but a movie is rarely just a mystery movie, seeing as the genre crosses over well with the thriller, crime, film noir, and psychological drama genres." - collider.com
