A sudden anonymous letter broke everything, full internship police detective followed the letter to the long abandoned thirteen middle school time flies, the eyes of 十三 middle school is not once the ordinary middle school is a trap? Or the truth? Countless secrets and once unknown past as Manman into the campus at that moment began to surface gradually to collect all kinds of props and clues, complete the complex puzzle game, finally uncover the truth please follow this heart, will solve the mystery of who is the real Strayer