More than 100,000 yuan suddenly disappears from the village collective fishpond, yet the profit-sharing figures show no obvious irregularities. After taking over the investigation, Lu Chengwen discovers that the proportion of premium fish has changed from "more than half" to 445, night-shift records show unexplained absences, aerator No. 2 makes strange noises late at night, and there are suspicious discrepancies in feed batches. Every expense has an explanation, but none of the evidence fully adds up. Just as the villagers compete to divide the profits, strange incidents begin occurring one after another in the fishpond's northwest corner. Who tampered with the accounts, and who is concealing the truth?