I honestly had no clue what to think after first viewing this film. It begins and ends with graphic sex scenes, and the moral tone is ambiguous at best. After all, our two main characters are a middle-aged kidnapper and a rich girl who sells herself for kicks. At times the pacing is tedious, and it's difficult to tell what the characters are feeling because the range of emotions they display is minimal. Despite all this, I found the whole thing fascinating, and when it was over greatly enjoyed watching it again.
In many ways the film is perplexing. It shows us a riveting and intense slice of life, but that slice is presented with minimal context. We know a kidnapping has occurred and the victim has died, but other than that, no details are forthcoming. We're also never told how the (highly unlikely) relationship between the rich girl and her chauffeur began, but it's obvious that it's complicated, emotional, and passionate. Thematically, this is a film about keeping secrets, and what those secrets can do to us. It also has something to say about sin, redemption, and social distinctions.
This isn't a film for the squeamish, or for those who want the story spelled out for them. But, if you can get past that, it's a film that will draw you in, keep you watching, and keep you thinking long after it's over.