Night Fall by Nelson DeMille

Based on the TWA 800 tragedy, this is another good John Corey, anti-terrorist task force agent, novel. After his wife and fellow agent, Kate, takes him to the memorial service for the 5th anniversary of the crash, Corey gets manipulated by her into researching the case. However, because the investigation is officially closed and was ruled an accident, Corey hits a few bumps in the road trying to get to the truth of the matter. Tragic beginning and end but filled with excitement in between.