At three o'clock in the morning, Xu Zhiyao, a former 110 operator, inherited the junk shop left by his father before he disappeared. On the first night of guarding the store, an unclaimed red umbrella suddenly played an alarm that the girl failed to call: "Uncle said he would take me to see my mother tomorrow, but my mother is already dead."
From then on, every morning at three o'clock in the morning, an old object would send out a thirty-second cry for help on behalf of its owner. The sound may come from the past, the present, or from impending danger. Xu Zhiyao must find the owner before time runs out, and then use surveillance, paper files, logistics and testimony to turn the unproven voice into a clue that can be processed in reality.
But every time she saves a person, cracks will appear in the old things, and she will lose a familiar voice forever. As the unnumbered No. 0 Recorder started on its own, she discovered that her father's disappearance, the rewritten request for help records, and a series of "correct decisions" in Linjiang City were all connected to a line that should not have existed. The most dangerous thing is that the circuit is learning her voice and starting to make choices for her.
