Finding a Needle in a Haystack

Core premise: By default, you are an ordinary resident in the city. It is best to live on the 10th to 15th floor of a high-rise building to avoid the problems of being surrounded by low-rise buildings and having difficulty escaping due to water cuts in high-rise buildings. Zombies are a classic setting - relying on sound/smell tracking, no intelligence, being infected if bitten, and the head is the only weak point. The whole city breaks out simultaneously, social order is completely paralyzed within 3 hours, and water and electricity communications are interrupted for 72 hours. Part One: Top-secret preparation plans 7 days a week in advance Core rules: keep the whole process absolutely confidential, don't tell anyone, including close relatives, and don't do any abnormal behavior that attracts others' attention. The risk to humanity is far greater than that of zombies This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.