That's Not My Name by Megan Lally

 

Mary has amnesia. She is found by the side of the road and taken to a police station and a man who has her birth certificate and photos frantically comes to take her home. But Mary doesn't remember this father who takes her to a cabin in the woods, doesn't answer her questions, and tries to dress her in conservative clothes. As a reader, it's pretty clear that this man might not be her father, but who is he and why does he have photos of her? 

Meanwhile, in a separate story, a teenager named Drew is searching for his missing girlfriend, Lola. He was the last one to see her alive and is a suspect in her probable murder. All he wants is to find Lola alive. 

These stories are going to intertwine and the real question is whether or not Mary is Lola and whether she will live long enough to be found. This is a gripping mystery for high schoolers. I was hoping it would work for middle schoolers who are clamoring for thriller/murder mysteries, but there was enough language and themes to make me feel like this is better left for 9th-12th graders. Definitely recommended for older teens looking for a suspenseful thriller.