Li Chengchao becomes famous for writing the horror novel Cross-Stitch, then unexpectedly receives a red package from "No. 444 Fenghua Street," a cemetery. The sender is Luo Mingming, who died three years ago. In a classroom sealed shut, he encounters a mysterious girl embroidering a cross-stitch, then discovers that she looks just like the girl in the package's photograph and the newly transferred student, Xi Yueyue. After Teacher Zheng is stabbed to death with a needle, Li Chengchao uncovers the truth: years ago, Luo Mingming's cross-stitch designs were plagiarized by Zheng Lan, who then locked the doors and set the place on fire, killing her. Now Luo Mingming has returned under the identity of Xi Yueyue. In the end, Li Chengchao finds Luo Mingming's former lover, Wan Changfeng, and together they resolve the old grievance at the cemetery. Luo Mingming is finally able to rest in peace, and Li Chengchao brings his novel to an end.
