The Collectors by David Baldacci

In Washington, D.C, where power is everything and too few have too much of it, four highly eccentric men with mysterious pasts call themselves the Camel Club. Their mission: find out what's really going on behind the closed doors of America's leaders. The assassination of the U.S. Speaker of the House has shaken the nation. And the outrageous iconoclasts of the Camel Club have found a chilling connection with another death: the demise of the director of the Library of Congress's rare books room, whose body has been found in a locked vault where seemingly nothing could have harmed him. A man who calls himself Oliver Stone is the groups unofficial leader. Staying one step ahead of his violent past and headquartered in a caretaker's cottage in Mt. Zion Cemetery, Stone, drawing on his vast experience and acute deductive powers, discovers that someone is selling America to its enemies one classified secret at a time. When Annabelle Conroy, the greatest con artist of her generation, struts onto the scene in high-heeled boots, the Camel Club gets a sexy new edge. And they'll need it, because the two murders are hurtling them into a world of high-stakes espionage that threatens to bring America to its knees. From an ingenious con in Atlantic City tho the possible forgery of one of the rarest and most valuable books in America history, to a showdown of epic proportions in the very heart of the capitol, David Baldacci weaves a brilliant, white-knuckle tale of suspense in which every collector is searching for one missing prize: the one to die for... (Goodreads.).