[Two-way rush + Iceberg vs Detective]
Wugang is a city that relies on raising and lowering seawalls to survive. Nine years ago, District 17 was abandoned in a storm surge. Qiao Zhiqi, a tide restorer, lost his mother and his hometown. Now, a letter sent from the abandoned "night mail" system passes through the water, accurately predicting that the East Levee will lose control again in twelve days. The letter contained only one warning: Don't let anyone else sign for you.
To find out the truth, she had to join forces with Xie Linchuan, the seawall auditor who had participated in the evacuation model and whom she had hated for nine years. Erased requests for help and testimonies appeared one after another in the unmanned mailbox underground in the old city, in the floating archives offshore, and in the power station at the center of the storm. When the city packages the disaster as a necessary price, can they find the last piece of evidence before the red tide lands and let the 80,000 silent people be heard again?
