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This book is a long historical spy novel. The story takes place after the Battle of Southern Henan during the Anti-Japanese War. The Nationalist Government had many casualties and was in urgent need of field medicine. The shipping line used to transport supplies was completely cut off by the Japanese army. It was necessary to quickly restore the destroyed Gyantse-Kalimpong (India) trade route so that silk from the rear could be transported to Calcutta, India, to purchase war supplies. The story revolves around opening up the India-Tibet route and ensuring the transportation of war supplies.