In this dark psychological thriller, a wealthy husband turns up dead, and his abused wife is charged with the crime. She calls Riley for help - and yet it seems clear she is guilty. But when another wealthy, abusive husband turns up dead, the FBI is called in, and FBI special agent Riley Paige wonders: is this all a coincidence? Or could this be the work of a serial killer? What ensues is a game of cat and mouse, as Riley Paige realizes she is up against a brilliant and unpredictable killer, one without a clear motive - and one determined to keep on killing until he is caught.