Lincoln Rhymes and Amelia Sachs are working on a case in the diamond district of New York. A diamond cutter was found tortured and murdered and an engaged couple who had stopped by to pick up their rings were also murdered. The culprit took uncut diamonds from the scene but left behind cut diamonds worth a lot of money. When more couples are targeted it seems the people are the target not the diamonds. The killer aka the Promiser has left a witness at the first scene and he is determined to find and eliminate him. When chaos strikes the city Lincoln and Amelia have more on their plate. They need to figure out what’s going on before more lives are lost.

There is a lot going on in this book, multiple plot lines that at first seem to have no connection. There are multiple twists that will make your head spin. This is part of the Lincoln Rhyme series but it could stand on its own. Thank you to net galley for an advanced readers copy of this book.