While Alan Rickman is perhaps one of the best actors around, this movie was NOT a vehicle that promoted him in any way, except to have him come in and out for those tension moments. A great actor like Rickman needs a stronger role to bring out his various talents in acting. This was a vehicle for Owen and his sister instead.
I hated this movie immensely, even with Alan Rickman in it (he is the only reason I saw it). Clive Owen, as nice looking as he is, was slimy in going after his sister, and his sister was even slimier for giving in. Incest is NOT a topic that ingratiates itself with viewers, unless they are morally deplorable in the first place. This is a movie you should watch with your eyes closed. Meaning, why bother watching it?