非常本格的推理作品，但是手法非常坑爹，非常不原创。导演骗人说这手法是他原创的。 An old lady is killed in a locked room under impossible circumstances. Five witnesses hear her screaming while trying to break open the door to her room. When they enter, she is dead but there is no sign of the killer or the murder weapon. Why would someone kill an old lady in a remote village. And more importantly: How did he do it?