The Vietnamese people have experienced thousands of large and small battles during the process of building and defending the country. Small but heroic, our forefathers made many glorious feats, overcoming all difficulties and hardships to regain independence and freedom for the nation. And one of the most important but least known feats is probably the feat of the Vietnamese intelligence force. The book is about the silent sacrifices and glorious feats of the precious political-military legacy of the brilliant General Dang Tran Duc (Mr. Ba Quoc).