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Spies spy on confidential information from the enemy or secretly carry out sabotage activities. They can unscrupulously peek into the privacy of politicians and civilians, and carry out kidnappings, assassinations, stealing intelligence, smuggling arms, etc.; Sometimes they transform into civilians and break into various groups to spy on intelligence. This book selects some wonderful stories from a large number of real spy cases and presents them to you one by one. They are both real and eerie, fascinating and mysterious.

This book takes mystery as the main line and describes the secrets of World War II, allowing readers to deepen their knowledge and understanding of World War II. This book emphasizes the power of mystery, but also emphasizes the truth. This book describes in detail many little-known facts related to World War II from nine aspects, and presents the mysteries and truth of World War II in a documented way.

The National Security Agency of the United States, or NSA for short, surpasses the Central Intelligence Agency (CIA) and the FBI (FBI), and is the largest, most powerful, and most mysterious intelligence agency in the world. The "Prism" eavesdropping program brought the US National Security Agency to the surface and became the focus of people's attention. It has a network information system that monitors the world and has a decisive influence in the international intelligence community. "Secrets of the National Security Agency" reveals in detail the background, development, influential leaders of the National Security Agency, and its behind-the-scenes operations in previous wars and incidents, allowing people to clearly understand the process of NSA's continuous development and growth in the past century.