Fifteen-year-old Mary Vincent was hitchhiking to Berkley, CA from her home in Las Vegas, Nevada, when the unthinkable happened. A monster picked her up on the side of the road outside of Modesto, CA, to give her a ride. And then many more unthinkables happened before Mary Vincent would be left for dead at the bottom of a cliff. The monster? Larry Singleton. And this was just the beginning of his crimes. This is the chilling story of Mary Vincent, Roxanne Hayes, and their attacker, Larry Singleton.