The Mysterious Lock: The Escort Agency's Family Chronicle

Lin Jinglan, the female escort chief of Longmen Escort Agency, loves codes more than finery. She improves the ancient "escort-flag cipher," invents her own "character-splitting code," and embeds special clay markers between layers of porcelain to create "cargo fingerprinting." To build a safe, efficient logistics network, she uses the Military Preparation Records as her foundation to devise an "escort-route map," transmitting top-secret routes through combinations of the first characters in poems. She also introduces a risk-hedging strategy for splitting up escort assignments. When faced with a conspiracy to hijack the caravans, she joins forces with like-minded allies to form the Martial World Escort Alliance. With clever code warfare, they avert disaster and bring about the Escort Route Safety Pact. Amid flashing blades and cryptic codes, this is a legendary journey about protecting trust, conveying heartfelt sentiments, and finding true love.