Stone Cold (The Camel Club #3) by David Baldacci

'I can't believe you haven't heard . . . Somebody blew up Carter Gray's house last night, with him in it . . . I think the FBI will want to talk to you about your meeting with Gray.'
Stone clicked off.
The FBI will want to talk to me. About Gray. Annabelle said sharply, 'Trouble?' 'A little,' he said slowly as his thoughts raced ahead. 'Maybe more than a little, actually.' She tapped her coffee cup against his. 'Welcome to the club.'

Casino king and vicious thug Jerry Bagger is hunting Annabelle Conroy, who conned him out of millions. Stone and his colleague's Reuben, Milton and Caleb marshal all their resources to protect Annabelle.

Yet their skills may not be enough when a deadly new opponent rips off the veneer of Stone's own mysterious past: Bagger's menace pales next to newcomer Harry Finn's lethal nature. Passing as a normal family man, Finn has already killed three men, with more targets to come. Finn sets his bullseye on Stone, but his reason is the greatest shock of all.

As bodies and institutions topple, the story rockets towards a shattering finale that will leave the survivors of this explosive tale changed forever.