Lethal Compound. Don Pendleton

U.S. intelligence agents become aware of a wealthy American's plans only when they intercept the chatter of Chinese spies.It is the billionaire's intention to lead a secret archaeological expedition into the mountainous border triangle between Afghanistan, China and Tajikistan. Mack Bolan is inserted within the group as they head into an area that is a hotbed of opium production.Traveling undercover with a group of foreign mercenaries hired to act as private security, Bolan knows that priceless treasure isn't the only thing hidden in the mountains of Tajikistan. And when they come under attack by Russian fighter jets, it becomes apparent to the Executioner that the unstable region is about to blow.