The Republic of China is at war, and war is coming. Situ Yuan, a young linguistics genius, accidentally discovered a dusty secret book in Xixia script in the secret room of his ancestral home. This seemingly ordinary ancient book is actually a relic left by my grandfather, and it contains the coordinates of a vital arsenal during the Anti-Japanese War! However, when the secret is leaked, Situ Yuan instantly becomes a target in the eyes of all forces: Japanese military agents are pressing closer, military commanders are both enemies and friends, and even academic colleagues are adding insult to injury, trying to steal research results. In the contradictory whirlpool of "protecting national secrets" and "preserving his own safety", he must race against time to decipher the cipher text, identify loyalties and traitors in layers of fog, and face the difficult choice of "academic research and the interests of his family and country." As the truth of the secret book is revealed layer by layer, a shocking conspiracy affecting the fate of the Republic of China emerges. Can Situ Yuan rely on wisdom and courage to turn the tide in troubled times and protect the hope of the nation?