Hell's Corner by David Baldacci

Oliver Stone is asked (by the government no less) to investigate a bombing that was successfully carried out right across the street from the White House. Which nasty group is responsible? Was the bombing an accident or a test, and is a bigger terrorist event planned? Oliver isn't completely comfortable working for the government that betrayed him, and finds himself misled and manipulated at every turn. He has the help of a competent and interesting British agent, but he is reluctant to involve the Camel Club. Nevertheless, he wants to solve the case, and it turns out he needs all the help he can get. Hell's Corner is a decent thriller, but not one of Baldacci's best.