This book is sad, because it's about a young girl who gets kidnapped by a man and turned into his sex slave.  He's functional and works, so she could escape anytime she wants, but she's afraid to, because she knows his previous victim was killed.  The book is very minimalist (which I love) and a quick read, partly because you won't be able to put it down.  It's exciting, the tension grows and grows, and you never know until the end what's going to happen.  I will not spoil it, though, so get the book and see for yourself.