Mack Bolan is a weapons specialist and skilled armorer who was serving his second tour of duty in Vietnam when he returned home on leave to the United States following news of the death of his parents and sister, and the critical wounding of his younger brother. Bolan discovered that a local Mafia family had been intimidating and harassing his family, as well as luring his younger sister into a life of prostitution, which resulted in a murder/suicide committed by his own father. Bolan decided his war with the "real" enemy was right here at home with the evil Mafia and not on the battlegrounds of Vietnam, 8,000 miles away.