Young Bill Wilder is devastated when he learns that his older brother is brutally murdered by a sadistic KGB agent in a North Vietnamese prison. He swears to avenge his brother's death, despite objections from his father, who is in the CIA hierarchy. An insane Ivan Petrov is bent on the destruction of the Wilder family after his own father is arrested by the British as a spy. After executing the oldest of the Wilder sons, he sets his diabolical plan in motion to kill Bill Wilder's entire family. Bill Wilder encounters his own version of hell in Vietnam. He must survive the jungle while being hunted by the Vietcong. His girlfriend, a UPI correspondent in Saigon, is murdered, and his best friend nearly dies as a result of Petrov's attack. A secret turn of events then helps Wilder discover Petrov's true identity. The hunt begins.