A locked body, a missing wife, a pencil that has been sharpened for twenty years. In Room 1304 of Yongle Apartment, a bizarre murder broke the calm before the demolition - her husband Lin Guofu died in the locked bedroom, and the back of his head was smashed to pieces. The perfect secret room, the perfect suspect, the perfect alibi. Huang Min, the criminal investigation captain, stood in front of the door that was broken open by the cutting machine. The metal door latch was locked tightly from the inside, the windows were tightly closed, and there was no trace of the murderer leaving. The only clue was a dozen sharpened pencils on the desk, as sharp as knives. Everyone in this building has a reason to kill him. An alcoholic and domestically violent husband, a wife who is as silent as a ghost, a daughter who is like a genius girl; a neighbor downstairs who owes gambling debts, and Aunt Zhang who likes to gossip... When the second body rolled down the stairs, Huang Min discovered that all the suspects were wearing masks of "perfect victims", and the truth was like a pencil that has been sharpened repeatedly - the sharper, the easier it is to break.
