The list of traitors in Nanjing has been locked by the Japanese army's highest encryption code, and the whole city will be slaughtered in three hours. Bai Zhiqiu stared at the message and sneered: "This code... I told them." A madman who can infer the enemy's psychology based on Morse's rhythm. What she wants is not to decipher it, but to blow up all the enemies hiding in the dark!