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Song Lixue, a student in the philosophy department of Tianya University, and Sun Xiaoling, a "genius girl" in the physics department, were invited to attend the birthday party of Shen Yixin, the daughter of Qingyun Group. Shen Yixin's mother, fiancé and four of her high school classmates also attended. The banquet venue was located in the remote Gunan Village. The "Spiral Villa" where the banquet was held and the "Spiral Tower" used for accommodation stood side by side. A tense episode did not affect the warm atmosphere of the banquet. After the banquet, everyone checked into the "Spiral Tower". The next day, Shen Yixin was found to have fallen from the room on the twelfth floor. The room was locked from the inside and was a "high tower secret room." At the same time, the only suspension bridge connected to the outside world was destroyed. Everyone was trapped, and bizarre secret room murders occurred one after another. How did the murderer use the "spiral tower" to achieve an almost perfect crime?