Christiane F.: Wir Kinder vom Bahnhof Zoo — Ulrich Edel's 1981 film version of the true story of Christiane Felscherinow, who was turning tricks to support her heroin habit at the age of 14. The soundtrack is by David Bowie, who also appears in a concert scene in the film.
It's really grim stuff, of course, but it's an excellent (though abbreviated) adaptation of the book, which I read in the original German not long before I first saw the film, about ten years ago.