C49 Murderer

While Lin Manrou was sleeping soundly, she was awoken by a knock on the door. Bewildered, she thought he was at home. She turned around and called out to him, "Yuxi, isn't the key right under the carpet outside? Take it out yourself."

Just as she finished her sentence, the sound of a key being inserted into the keyhole rang out. Then there was a pause, as if there were more than one person there