Shen Yan, a restorer at the Municipal Archives, can hear the echoes of memories left behind in old objects. The price is that every time he deliberately uses his ability, he loses one of his own memories.
He survives by keeping restoration logs. The first thing he does every morning is read what yesterday's version of himself wrote.
Then, at 2:17 a.m., a copper-cased pocket watch stopped at 3:04 speaks in his mother's voice: "Don't let him take the archive."
A broadcast announces the night restoration rules: Do not answer. Do not take anything away. Return it to its source archive bag before 3:04. If you see an archive bag bearing your name, do not open it.
Someone outside the door claims to be Zhou, the night-shift attendant, but his badge number is fake.
And on the surveillance footage, a "Zhou" is standing outside Shen Yan's door.
What Shen Yan doesn't know is that a company called Zero operates in this city, specializing in deleting people's memories. Each deletion leaves behind a "blind spot" in the city: a place surveillance cameras cannot see, maps cannot locate, and everyone remembers but no one can clearly identify.
He also doesn't know that his mother never disappeared. She hid herself inside the city's memory network and became the keeper of the rules in the blind spots.
He has only one partner: Lin Wu, an adviser to the criminal police. She doesn't believe in the supernatural and excels at behavioral analysis, but her own memories have gaps too.
They don't fall in love. They solve cases.
One restores objects; the other restores people.
And before he forgets who he is, Shen Yan must make a choice:
Restore his mother, or preserve his and Lin Wu's memories?
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