I was looking through the lists the other day and I found that no one had this film on any of their lists.
The Day of the Jackal is about an assassin, codenamed the Jackal, who is assigned to kill the President of France. The film is great because it takes its time and builds on suspense rather than packing dozens of action sequences. The movie uses many off-screen deaths, but I think that adds to the overall ruthlessness of the assassin. Overall, anyone who wants to view this film has to pay attention; the movie can be pretty subtle.