Leon

Little girl with a messed up family befriends neighbour Leon - a hitman. When the little girl's (Mathilda) family gets killed by BAD narcotic policement she finds refuge with Leon. She wants to get revenge at the assholes (policemen) who killed her little brother, so she asks Leon to teach her how to be a hitman - how to "clean". Mathilda and Leon embark on an adventure during which Leon learns to read, sleep and appreciate life. And Mathilda gets her revenge. Really awsome touching film.

http://www.imdb.com/title/tt0110413/