Set in Rain City during the Republican era, this story follows Shao Wenchuan and Ruan Qingxian as they investigate the switched account books of the relief committee. Starting from details like the paper, sealing wax, and keys, the two insist on letting evidence speak—neither trusting rumors nor rushing to condemn the missing auditor. As the investigation deepens, they recover the original ledgers and bring the relief funds back under review. Centered on reason, collaboration, and responsibility, the story shows that when facing suspicion, one should respect the facts and dare to shoulder responsibility—using patience and conscience to guard the truth, and with it the public interest.