The Collectors is the second book in the Camel Club series by David Baldacci.
This novel was published on October 18, 2006 and was a #1 NYT bestseller.
The Collectors book description
Oliver Stone and his Camel Club are in a race to stop a man who is determined to auction off America to the highest bidder: Roger Seagraves is selling America to her enemies, one devastating secret at a time.
On a local level, Annabelle Conroy, the most gifted con artist of her generation, is becoming a bit of a Robin Hood as she plots a monumental scam against one of the most ruthless businessmen on earth.
As the killings on both fronts mount, the Camel Club fights the most deadly foes they’ve ever faced.