From The Movie Snob:

Dirty Pretty Things. (A-) I can't remember the last new release that I thought was worthy of any sort of A, and maybe this one is really more of a B+. But it was very good, let's leave it at that. It's about illegal immigrants in London, although any large Western city could probably be substituted for London without changing the story. They live on the margins of society, and because they are wanted by the authorities they have almost nowhere to turn when unscrupulous people abuse and take advantage of them. In this story, a gentle doctor from Nigeria named Okwe works days as a cab driver and nights at the front desk of a hotel. On the rare occasions when he sleeps, he flops on the couch at the apartment of Senay (played by Amelie's Audrey Tautou), a young Turkish woman who is legally in England as an asylum-seeker but illegally working as a maid in the same hotel where Okwe works. The film is gritty and occasionally hard to watch (it involves the black-market trade in internal organs), but the story and characters are compelling.