For me, it's Saw 1, the movie from start to finish is very mysterious, I got totally involved with the story.
Which movie has the most immersive story?
The Hateful Eight by Tarantino
Lo imposible and titanic
Very interesting original story for the films Terminator - but only the first two films, which directed James Cameron. All the subsequent films with this title are horror and moral terror for the fans of the original dilogy...