What movie is this...?

I can't remember the name of this movie I saw a few months ago. I don't recall there was a big name actor either, so I know it won't be easy. It's about a mom and son who go to a movie, and they take a cab to go home. Turns out it wasn't a cab, and the driver kidnaps them. I believe he ends up killing the mom, but he keeps the kid chained to a bed. the guy gives the kid books to read, and he learns quite a bit about medicine/surgery. a few years later, the kid manages to escape, and goes in search of his dad, who we haven't seen since the beginning of the movie.

If anyone can tell me the name of the movie, that'd be awesome. I've been to watch it again, but I haven't been able to find it for a couple weeks now. Thanks all.