I really loved this book. It was a hard to put down mystery for sure but I would not classify it as a thriller. I could really relate to these characters because I was a young mother once and I did participate in "baby groups" although my groups did not have this much drama! The characters were interesting and the book was well written. I could not figure out who the bad guy was which is often easy to do. I highly recommend this book if you enjoy a good mystery.