I love Jennifer McMahon and this title was no exception. It's well-written and deliciously creepy. I loved the characters, especially Reggie, who I connected with emotionally. It's a thriller, so the writing is par for the course for the genre. McMahon is one of my favorite types of thriller writers - the suspense and plot carry the book. It's thrilling and holds my attention without inserting unnecessary attempt at being literary, but the writing is also good enough to keep me from being distracted by poorly constructed dialogue or gaping plot holes.
I also think the author did an amazing job of keeping the book scary and holding the reader's attention without resorting to graphic depictions of violence. It's certainly scary, but it is a much more subtle suspense than many thrillers that rely on torture porn to hold the attention of readers. McMahon is able to capture the reader without the use of cheap tricks commonly found in thrillers. I read it in two sittings and loved every minute.
McMahon is quickly becoming one of my favorite suspense authors. She writes well, doesn't over-embellish, and refrains from using gore to keep the reader interested. Her books make sense and are easy to read, but the writing is done well, so there aren't any distractions. I recommend giving it a try.