My name is Yuxiu, a down-and-out mystery novelist. I was involved in the case of murdering my mentor. In the detention center, I met Liang Zeqi, a Go master who was also imprisoned, and Shi Lingcheng, a guard who was willing to help me. In a limited space, In just seven days, can they successfully help me get rid of the crime? The shocking mystery of the serial murder that was predicted in the posthumous work of my mentor is even worse, and there are so many clues behind all this, what secrets are hidden among them? Can you trust them again?