"The Day of the Jackal" (1973) is a great thriller. Done in almost documentary style, this movie was involving for me from the first minute till credits start rolling. Its a very skillfully made thriller shown from both sides - from a hit man and his pursuers. The mystery of the hit man itself was other very interesting thing, and i loved the they kept a secret till end without any revelation - it feels more menacing.
Overall, "The Day of the Jackal" (1973) is a superb thriller that hold up highly well even now first time seeing it in 2019. A great thriller.