The black door of the Salt Tax Office recognized paper by day—and food by night.
When Xu Jinghong brought Qin Zhao back, the sky hadn't fully darkened. Shops along the street were closing; vendors selling flatbread, noodle broth, and braised tofu still had one last pot of steam left.
Xu didn't stand at the door.
She chose a sesame-flatbread stall diagonally across the street and sat on a low stool at the very back.
The shop was hot, the brazier hotter. Sweat beaded on Qin Zhao's forehead. He couldn't help asking, "Are we really waiting here?"
Xu broke half a bun and answered in a low voice.
"We wait.""This route is worth more than paper."
"Why?"
"Paper can be delayed," she said. "Food can't.""If paper arrives late, they curse a few times. If food arrives late, the people inside have to come out."
Qin Zhao fell silent.
He understood now that Xu never chose a place at random. This stall faced the black door directly—every opening and closing could be seen. And because it sat beside heat, lingering there didn't look suspicious; it looked like resting and eating.
At dusk, the black door stayed shut.
The first to arrive were charcoal carriers—an old man and a boy with half a basket of broken coal. The key-clerk lifted the basket lid once and let them in.
Later came water. An older woman carried two copper kettles, the spouts plugged with burlap. She didn't use the main entrance either.
Watching, Qin Zhao murmured, "Charcoal, water, food—everything goes through that door."
Xu nodded. "Because the people inside won't see outsiders, but they still have to eat, drink, keep lamps burning, and stamp paper."
Qin Zhao asked, "Then what is the key-clerk actually recognizing?"
"Not people," Xu said. "Procedure."
She laid out the three things they were here to identify:
"First: who delivers the food.""Second: when it arrives.""Third: how many portions go in."
Qin Zhao understood.
Tonight wasn't about whether they could enter—it was about how many people were moving behind that door.
A little later, a young carrier appeared with a shoulder pole.
A stack of food boxes hung in front; a soup bucket swung behind. He didn't hurry, but his shoulders were steady—clearly not his first night doing this.
The flatbread vendor watched him pass and muttered, "Again—work from Fushun Restaurant."
Qin Zhao's ears sharpened.
Xu didn't turn her head. She set two copper coins on the table and asked the vendor casually, "Who's he feeding?"
The vendor, busy flipping buns, answered without thinking. "Who else? The paper-pushers in the offices.""Daytime is the outer hall. At night they sometimes add a run—food for the few inside."
"Every day?"
"More or less." The vendor snorted. "Hot dishes, hot soup—the money's good. But the rules are ridiculous. The runner can't change. The timing can't slip. And the boxes can't be opened."
Qin Zhao's pulse kicked.
Runner can't change. Timing can't slip. Boxes can't be opened.
Those weren't food rules. Those were door rules.
Xu asked once more, "What does he bring?"
"Two meat dishes, one vegetable, a bucket of soup, two boxes of white rice," the vendor said. "Depends how late they work. If they go deep into the watches, there's a midnight snack too."
Then the vendor lowered his voice. "But these last two days are different."
"How?"
"There's one extra portion now.""And they added a palate-clearing dish, plus a cup of ginseng broth. That's not for minor clerks. Minor clerks can't afford it—and they don't rate it."
Qin Zhao understood immediately:
There was one more person behind the black door—and not an ordinary one.
Xu didn't ask more. She finished her bun slowly, face blank, mind already stitching the new line into place:
Shen Weijun could validate paper into the door.The black door could send sealed tubes outward.Now someone inside was drinking ginseng broth.
Either a superior to Shen—or someone there to push the grand seal.
The food carrier reached the black door and paused.
The key-clerk didn't open at once. He asked, "How many?"
The carrier answered like a man reciting practice. "Eight for the outer hall, four inside. One soup bucket, two rice boxes."
Four inside.
Qin Zhao's fingers tightened.
Until now they'd only seen the gray-jacket clerk, Shen Weijun, the key-clerk—perhaps one junior courier with a tube. Four portions meant at least one more person they hadn't seen.
The key-clerk asked again, "Ginseng?"
The carrier lifted a small black jar from the back end. "Separate."
Only then did the key-clerk open the door.
As always, only a slit.
The carrier ducked through—food boxes first, body after. The shoulder pole nearly scraped the frame. The key-clerk reached out and steadied it, like he was afraid of spilling more than soup.
Qin Zhao saw it clearly:
This wasn't ordinary food delivery.This was a lifeline being carried through procedure.
After the door shut, Xu didn't leave.
She waited for the second thing: when the runner came back out, would the pole carry anything new?
Less than half an incense-stick later, the runner returned.
The front boxes were empty. The soup bucket was lighter. But one detail had changed:
a small paper parcel now hung from the inner side of the carrying rope.
It was tight-tied, tucked deep where the rope looped closest to the pole.
The runner walked more carefully than before—as if what might fall wasn't paper, but a life.
Qin Zhao whispered, "What is that?"
Xu didn't guess yet. She stated what she knew.
"Not leftovers.""Leftovers aren't tied that tight, and they aren't hung inside the rope."
"Could it be a draft?"
"Maybe," she said. "Or medicine. Or a note."
"Do we follow?"
Xu looked toward the street mouth.
It was darker now. Fewer people. In this kind of dark, following too close got you recognized.
She thought for one beat, then said, "Follow—but don't stick. Just learn where he goes."
Qin Zhao stood. "I'll do it."
Xu didn't stop him. She gave him two rules:
"Don't watch his face.""Watch the pole."
Qin Zhao nodded and slipped out.
The runner didn't go back to Fushun Restaurant.
He crossed two streets, then turned into a narrower alley. At the alley mouth was a pharmacy, its door half closed, lamp still burning inside.
The runner approached and gave a soft cough.
No one came out. Only a hand extended from the darkness.
The runner unhooked the tight little parcel from inside the rope and placed it into that hand—without a word—then turned and walked away.
From behind a stack of firewood at the alley mouth, Qin Zhao watched until his back went cold.
This "food route" wasn't only bringing food.
It was carrying something out of the black door—and into a pharmacy.
A pharmacy.
Medicine, ginseng broth, the black door, restored countersigns, the master register—threads snapping together at once.
Qin Zhao didn't follow the runner again. He went straight back to the grain shop.
Xu Jinghong listened and asked only three questions:
"What's the pharmacy called?""Is there a sign hanging outside?""Which hand took the parcel—left or right?"
Qin Zhao replayed it and answered one by one:
"It's called Ji'an Hall.""There's a half plaque shaped like a medicine gourd.""It was the right hand. Callus at the thumb web—like someone who opens drawers all day."
Xu nodded. "Not the shopkeeper. More like a dispenser."
Chao Sheng, hearing it all, gave one verdict:
"The black door is running two routes.""One delivers notices.""One delivers medicine."
Qin Zhao frowned. "What use is medicine?"
Xu Jinghong looked at the lamp wick and unspooled the line slowly:
"If there's truly an extra person inside, and he alone drinks ginseng—""then he's either high-ranking, or he's unwell.""And the medicine isn't for outsiders. It's keeping someone inside alive."
Qin Zhao froze.
"So… the person we haven't seen might not be able to come out on his own?"
"Yes," Xu said. "He may be someone who can't stand long, can't sit long—someone who has to be propped up by medicine just to write, or just to stamp."
She paused, then added, colder:
"That kind of person is more dangerous.""Because he knows he can't afford mistakes—so he'll be harsher."
Chao Sheng asked, voice flat, "Cut the medicine line?"
Xu shook her head.
"Cut it and they panic.""Panic closes the door hard."
She looked at Qin Zhao.
"Today you identified two things.""One: there's one more person behind the black door.""Two: after the food goes in, a parcel comes out—and goes to a pharmacy."
"Tomorrow we identify the third."
Qin Zhao asked, "What?"
Xu answered:
"Who ordered the ginseng.""Who wrote the prescription.""Once those two match, the unseen person inside takes shape."
And for the first time that evening, a thin edge of frost showed in her voice:
"We're not trying to enter the door yet.""We're going to write the invisible person into existence—through a prescription."
(End of Chapter.)