Body Double: Tess Gerritsen

This was a Rizzoli and Isles book, I like the series of Gerritsen, I have trouble getting into her other books. Isles comes home from vacation to find a dead body in front of her house- that looks just like her. In this book she finds out her parents were mass murders attacking pregnant women and selling their babies and that she had a twin sister. Rizzoli was pregnant in this book and I was expecting her to be kidnapped, I was glad it didn't happen.