The Greek Gambit — Charles A. Salter

Along the North Carolina coast, random people are aging decades in days and dying within a week. Suspecting some weird new form of radiation, the Pentagon sends its top secret Nuke Response Team Alpha to investigate. Team chief Colonel Blake Hunter is on vacation in Greece when unknown agents try to kill him and kidnap his young family. What horrifying new weapon have the terrorists created? How can Hunter stop them when his wife and children are in the danger zone?