In a century-old foreign-style building, tenants disappeared mysteriously one after another, leaving only a copper bell with "return date" engraved on the scene. The trace examiner was ordered at the critical moment, and from the rags in the cracks of the floor, the bones in the flue, and the yellowed old diary, he gradually disassembled the mystery of revenge that spanned three generations. There is no love entanglement, only cold details and sleeping truth - when the bell rings again, who should pay for the blood debt a hundred years ago?
Purpose: Perseverance in exploring the truth, exposing historical malaise, and leaving no place for evil to hide.