Deadlock - Catherine Coulter

"A young wife is forced to confront a decades-old deadly secret when a medium connects her to her dead grandfather. A vicious psychopath wants ultimate revenge against Savich, but first, she wants to destroy what he loves most--his family. A series of three red boxes are delivered personally to Savich at the Hoover Building, each one containing puzzle pieces of a town only FBI agent Pippa Cinelli recognizes. Savich sends in Cinelli to investigate undercover but someone knows who she is."--from Amazon.com.