
📕 Story Background
The seaside town’s post office is about to close.
Before leaving, Gu Yan, the town’s respected lighthouse keeper, wrote seven letters and gave them to seven different residents.
However, the seventh letter, which was supposed to be delivered to the mayor, mysteriously disappeared.
The envelope had not been opened, and there were no signs of forced entry. Stranger still, everyone remembered seeing only six letters.
What did the seventh letter say? Who took it? And why did someone want everyone to believe that it had never existed?
Possible Locations
Location A – The Post Office Archive Room
A narrow room filled with old letters and official records. The window is small, difficult to reach, and usually kept locked.
Location B – The Mayor’s Office
A private office overlooking the harbor. The mayor claims that he never received the seventh letter.
Location C – The Lighthouse
An isolated lighthouse at the edge of town. It contains an old spare-lamp box that is rarely opened.
🔍 Known Clues
1.The post office register jumps from number 6 directly to number 8.
2.A fragment of the seventh envelope’s wax seal was found in the lighthouse keeper’s old raincoat pocket.
3.The clock on the post office wall is seven minutes slow.
4.The mayor claims he never received the seventh letter, but there is a fresh drop of seawater on his desk.
5.The postal clerk says nobody entered the archive room, yet there is sand on the inside of its window.
6.A fisherman heard the lighthouse bell ring three times at midnight, although the bell can only ring twice in succession.
7.The recipient of the sixth letter insists that its envelope had been resealed.
8.There is only one set of footprints in the sand outside the post office, and they lead away from the building.
🕵️ Questions and Discussions for YOU
1.Who took the seventh letter?
2.Where was the letter hidden?
🎉Participation Rewards
The FIRST user to successfully deduce the identity of the "culprit" and their motive in the comment, will receive a reward of 2,000 GT points! Other participants will earn 200-500 GT points based on the completeness of their submissions. 💰 (Except for extended special edition)
📅Submission Deadline
September 25, 2026
Reminder: This is the submission deadline if you want to claim the reward with your vote, but after this date the vote will still remain open for a period of time, so please feel free to participate at any time if you want to test your skills, detectives!
----- Previous answer(The Bell That Vanished)-----
Correct Answer: C – The Abandoned Service Elevator
The Deduction Logic:
The Midnight Bell was not removed through the main lobby. The entrance was continuously monitored by guards and security cameras, and no one was seen carrying a large object outside.
The old service corridor was used to transport the bell, as shown by the fresh dust marks and tiny brass fragments found along the floor. However, the bell did not remain there.
The fragments led directly to the abandoned service elevator. Although the elevator had supposedly been disconnected for decades, its mechanical system had recently been inspected. This means it could still be operated manually during the six-minute power outage.
The security system recorded no opening of the display-room door, while the disturbed dust around the elevator’s inner door proved that the bell had been moved through an old hidden route connected to the elevator.
The handwritten note—“The bell was never meant to stay in the tower”—also suggests that someone familiar with the hotel’s original structure deliberately moved the bell to a secret location.
Therefore, the Midnight Bell was transported through the old service corridor and hidden inside the Abandoned Service Elevator.
We will be rewarding 200 GT points to all players who voted correctly, and additional points to some outstanding responses.

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