On a sunny Sunday, the president of Bayleaf Company died suddenly in his office. The cause of death was a severe blow to the head, and the scene was a glass secret room under seven layers of security. The office is on the 12th floor. The entire building is surrounded by embedded glass windows, making it impossible to enter from the outside. There is a security room at the entrance of the building, and registration is required to enter the building. The elevator to the 12th floor requires special password authentication. All the stair doors leading to the 12th floor were locked that day, and there were no signs of lock picking. There is a surveillance camera at the door of the office, which was operating normally at the time of the incident. The office has glass windows, all made of bulletproof glass. There were three secretaries working nearby at the time of the incident and no abnormalities were found.

How did the murderer break through these seven levels of security, commit murder and escape unscathed?

Japanese fiction translations into Chinese.