My all time favorite book has to be Three Days by Donna Jo Napoli. I read this when I was in middle school and have not been able to forget it since! I'll give you a quick summary of the book: 

A girl named Jackie and her father were on vacation in a foreign country and something happens to her father while driving the car. While being stranded on the side of the road, two men pull up, and help her in their car. She first thinks that they're there to help her, but then her mind is changed rather quickly. Throughout the rest of the book you can almost feel as if you can see where she is, and what is happening to her. It describes her struggles, and her plans to escape. 

I would most definitely recommend this book if you enjoy the more "thriller" types of books. It kept me on the edge of my seat!