David Baldacci neatly ties up all the threads in this series where FBI agent Atlee Pine, based in Arizona, has been desperately searching for her twin sister, Mercy, abducted at 6 years old from their bedroom. The main points are summarised at the beginning, a great reminder of the twists and turns that have occurred, including the discovery that Atlee's father is not Tim, but actually Jack Lineberry, and that Mercy had been imprisoned, exploited, tortured and abused by her 'adoptive' parents, Joe and Desiree Atkins, and had possibly escaped. Atlee is once again aided by her FBI administrative assistant, Carol Blum, a woman who has become like a mother to her, as she tries to follow all leads to learn if Mercy survived. She reluctantly accepts the substantial resources, financial and otherwise, offered by Lineberry in the quest to locate Mercy.
For the first time, the author gives Mercy's perspective, and through this we learn what happened to her once she was free, a naive young woman who had never been to school and knew nothing of the world. Almost inevitably she is used by others who take advantage of her, falling into poor relationships and the partaking of drugs. However, she has an inner strength that pulls her through the hard times and she has survived, damaged physically and emotionally, but she has lived to be working several very low paid jobs to just get by. She has read widely by spending time in libraries, and learned to look after herself by training, becoming talented in the mixed martial arts, which is where we meet her as she fights an opponent for the much needed $1000 dollar prize money. She is a loner, helping others when she has money, and living in insecure poor accommodation, but she has many of qualities of her twin sister, Atlee.
It is when she helps a woman escape a abusive man that Mercy makes an enemy. It is this villain who brings deadly danger to Atlee, Mercy and Carol. This is an entertaining and engaging read that I enjoyed, but it felt like the weakest book in the series, where it felt like the author was under heavy pressure to conclude everything, and in the rush to do this, the plotting and the characterisation became a little too formulaic for my tastes. Nevertheless, this is a series I have enjoyed, I am assuming this is the end, although I might be interested in seeing how Mercy and Atlee develop as strong women working together from the beginning on intricate and complex investigations. Many thanks to the publisher for an ARC.