This book is artistically created based on typical cases of national security work in the new era. While investigating a cross-border gold smuggling case, the China-ROK joint investigation team unexpectedly seized a large number of historical silver dollars and old versions of RMB, providing clues to the economic crime network left overseas. The investigation team divided into multiple groups, went deep into factory docks, cultural relics markets, and seed industry bases, and used scientific and technological means to engage in a battle of wits with transnational criminal groups. At a time of crisis, an autographed letter from a 90-year-old overseas Chinese in South America crossed the ocean - the old man cared about his homeland and took the initiative to donate his dusty archives: "Wandering all my life, I only wish to protect the mountains and rivers with my glimmer of light." The case has promoted the implementation of actions such as the revitalization of the national seed industry, the protection of ancient Chinese medicine prescriptions, and the recovery of cultural relics. The national security spirit of "being firm and pure, reassuring the Party, willing to contribute, and able to work hard to win" runs through the book, showing the innocent heart of Chinese people at home and abroad to protect their cultural roots and safeguard economic security. At the end of each volume is a "National Security Lesson" to popularize anti-fraud and espionage knowledge. I would like to use this book to pay tribute to all the unknown heroes on the hidden front, carry forward the main theme of patriotism, and gather the majestic power of the entire people to protect national security.
