Stone Cold by David Baldacci (2007)

Baldacci has become one of my favorite spy novelists. This continues the story line of the Camel Club after the Collectors (where someone is killed in the Library of Congress). The plot is too complex to even begin to retell, but someone is killing off Oliver Stone's (AKA John Carr's) former colleagues in the super secret Triple 6 division. Then we have Annabelle Conroy running from crazy casino owner Jerry Bagger, whom she conned for killing her mother.