Lu Chen, a modern surveying and mapping engineer and online tracking blogger, fell into an underground river in a cave during a hiking expedition and traveled back to Lin Yanzhi, a 16-year-old boy in Wuhan in August 1938. His father was killed in an ambush during the operation to capture Japanese spies. The protagonist embarked on the path of "living first and assisting with investigation". He circled among the military, the spy camp, and the traitor underworld, secretly tracking down the mole, eliminating the spy, and eradicating the traitors. In the end, he not only found out the truth about his father's sacrifice, avenged his father, but also accumulated enough wealth to successfully evacuate to Hong Kong and Macau on the eve of liberation, and escaped from the troubled times.
