Another movie using the time traveling idea,you may say, but Déjà vu approach this in a unique way even using the same tools: a kind of machine which can teleport you back in the past, the existence of parallel worlds?like always time traveling machinery it?s not safe, but our brave hero (who is an ATF agent played by Denzel Washington) decide to take his chances and risk his life to prevent a crime. The things are the same like before and it seams that whatever he do, the future remain the same. In the newer present something really changed?and this will have a great effect (there are two Denzels :) ), but the solution to this problem is a simple one?someone have to die. It's a movie worth seeing, have fun doing it!