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This book is the first full-length locked room mystery novel in history, ushering in a new era for impossible crime mystery works. There is only one murder in the story, and only one murder that takes place in a secret room. One morning, Mr. Constant, who was renting at Mrs. Dutonpu's house, died in his room. The doors and windows were locked, and there was no one in the house except the corpse. The deceased was lying on his back with his throat cut. After a search, there was no trace of the murder weapon. The possibility of suicide is ruled out, so who is the murderer? How did the murderer create such a seamless secret room? This airtight room is the only mystery of the incident. Therefore, in order to solve this mystery, Scotland Yard, private detectives, various media and busybodies all attacked, trying to crack the secret room from all angles and in various ways, but the result was beyond everyone's expectations...