When Song Ci failed to pass the exam and returned, he was shocked to see an old man next door lying dead on the bed during a rainstorm.
The door was unfastened, the windows were closed, and there was only a pair of footprints on the dusty floor - apparently the deceased's own.
The villagers panicked and shouted that they were seduced by evil soldiers, but Song Ci pushed aside the crowd and squatted in front of the moldy door bolt.
"The door lock is intact. Only the murderer and the deceased were in the same room."
The leader was surprised and asked who it was.
Song Ci brushed off the dust from his fingers: "The answer is right in front of you."
"——In the door bolt that was repeatedly soaked and dried by water."
