The Sixth Man by David Baldacci

Enjoyed this book, the Camel Club friends would have been a nice addition. Edgar Roy-an alleged serial killer held in a secure, fortress-like Federal Supermax facility-is awaiting trial. He faces almost certain conviction. Sean King and Michelle Maxwell are called in by Roy's attorney, Sean's old friend and mentor Ted Bergin, to help work the case. But their investigation is derailed before it begins-en route to their first meeting with Bergin, Sean and Michelle find him murdered.