Black Ops by W.E.B Griffin

Black Ops: A Presidential Agent Novel - Charley Castillo learns that a reporter that works for one of his European newspapers is murdered. He also learns that a CIA couple is murder at nearly the same time. Then it comes out that a Secret Service Special Agent Jack Britton is nearly gun downed along with his wife in front of his home. Also, in Buenos Aires, an assassination attempt is made on Gendarmeria Nacional Comandante Liam Duffy. Because Charley and his Office of Organizational Analysis (OOA) group believe all these incidents are connected and are related to the OOA group, they get involved in investigating. Along the way, two Russian spies defect to Charley instead of the CIA