Before she leaves home every morning, she observes all things in the room carefully and remembers their positions, especially the slippers at the door. She lives on the second floor. The balcony is equipped with a burglary-resisting window. If someone wants to break in, he or she must enter through the door and will step on or kick the slippers carelessly.

She remembers clearly that the slippers were not placed in this way when she went out.

“Zhu, did you come ...