Missing Mother and Daughter

One night, the night duty officer of the property management community received a call from an old couple. The old woman on the phone said hurriedly: "Hey, property management? Come on! Come on! My house, the person opposite my house is missing..." The old woman said hurriedly, her tone full of emotion. Timid, the staff on duty comforted and asked the whole story. Finally, when the property security came to check, sure enough, the door of the house opposite the old woman's house was ajar. The security guard opened the door and saw dinner neatly placed on the dining table in the living room, and no one was around...