The Fifth Bomb — Kenneth Andrus

Crazed by the murder of his wife and child by paramilitary police, Bashir al-Khultyer has only one goal: To seek revenge against all those he feels were responsible for their deaths. In Russia, he steals enough nuclear material to construct five dirty bombs. When the first is detonated in Moscow, NSA analyst Nick Parkos must confront his own demons as he pursues al-Khultyer in an international manhunt to stop him before he can detonate his four remaining devices.