I read this book a few years ago. It’s a mystery thriller with some romance in it. I remember it starting off with a girl who was home alone and a killer enters her home and comes close to killing we her but her parents arrived home and scared him away. Her parents never believed her because all of the doors, windows and locks were still good and locked. Years later this woman never got over what she saw. years later the killer is released from prison. He got caught on something else and tries to find the one who got away to finish the job. It turns out he’s super flexible and able to get into small spaces like a doggie door which is how he got into the home without alerting anyone.
Lost Classics of Teen Lit: Name That Book! 