At first light, Xu Jinghong took Qin Zhao out of the grain shop.
She did not go to North Water Gate.
Qin Zhao followed for two steps and still couldn't hold it in. "North Water Gate is supposed to receive the master register today. Aren't we going to hold the line?"
Xu walked fast, but her voice stayed steady.
"Guarding a gate only means waiting for them to press you down.""Recognizing the right gate is the only way to press down first."
Qin Zhao stopped asking.
He understood now: whenever Xu Jinghong detoured, it was never for distance.She was hunting the route that paid the highest price.
Outside the Salt Tax Office, the morning was already loud.
Runners with notices. Clerks with paper. People carrying breakfast, charcoal, tea—moving in and out like a tide. The main entrance was the widest, the noisiest, and the most crowded. A wooden board beside it read:
ARCHIVES AREA. UNAUTHORIZED PERSONS KEEP OUT.
Qin Zhao glanced at it and murmured, "Is that the inner-office door?"
Xu Jinghong shook her head. "No."
"Why not?"
"Too bright," she said. "The door that controls the seal won't be placed in the brightest spot."
She led Qin Zhao across the street to the back of a tofu-pudding stall. The shop had just opened; steam rolled outward in a white cloud. The two of them stood behind the haze—unremarkable, uncounted.
Xu Jinghong laid out exactly what he was to watch today:
"Don't read signboards.""Watch three things.""Who gets in, what they must show to get in, and what they're carrying when they go in."
Qin Zhao nodded.
The first people through the main entrance were outer-hall staff.
They carried ledgers, notice tubes; some had small waist tags, some only a supply slip. The gate runners barely checked—one glance and they waved them through.
After a while Qin Zhao said quietly, "The main entrance checks faces."
Xu nodded. "More or less. The outer hall runs on flow-through work—speed matters more than stability."
"And the inner office?"
"Keep watching."
Half a quarter-hour later, an old man arrived carrying two baskets of charcoal.
Not full lumps—broken pieces. The guard didn't send him through the main entrance. He pointed to a narrow passage beside the wall.
The old man didn't argue. He turned into the passage and disappeared.
Qin Zhao blinked. "Charcoal doesn't go through the main entrance?"
Xu asked him, "Why do you think?"
Qin Zhao thought. "Ash would dirty the paperwork?"
Xu didn't confirm or deny. She only made him keep counting.
Soon after, an older woman came with hot water in a copper kettle. She didn't go through the main entrance either—she went into the same narrow passage.
Then came food carriers, seal paste carriers, tea carriers. None used the main entrance.
Qin Zhao's brow tightened.
"There's another door behind that passage," he said.
"Yes," Xu replied. "That's the first gate you're here to recognize."
They shifted position and circled to the outside of the Salt Tax Office's side wall.
The wall wasn't tall, but it blocked sight. At the end of the narrow passage, Qin Zhao could just see a small door left half-closed. It was black-painted, unmarked, and not wide—yet its threshold was higher than the main entrance.
A gaunt senior clerk stood beside it with a ring of keys hanging at his waist.
Everyone who approached this door had to pause.
They didn't announce names. They presented something.
Some handed over a wooden token.Some handed over a paper slip.Some handed nothing at all—only lifted a basket lid for the clerk to glance inside.
Only then did the clerk nod and open the door.
Qin Zhao watched the rhythm and felt something click. "This isn't taking people. It's taking goods."
Xu Jinghong finally gave him a clean confirmation.
"Yes.""The main entrance takes people.""This door takes what is allowed into the inner office."
Qin Zhao understood half of it at once.
"So the grand seal doesn't go through the main entrance."
Xu corrected him. "The grand seal doesn't walk through any entrance."
"It's the people who stamp, and the papers that need stamping, who use this door."
As she spoke, the gray-jacket man from the ledger office came out.
Under his arm was a stack of thin sheets, edges squared; a small board weighed the top.
He headed first for the main entrance. A gate runner stopped him with a short phrase:
"Inner office business doesn't go through here."
The gray-jacket man didn't protest. He turned toward the narrow passage by the side wall.
Qin Zhao's chest tightened.
Here it came.
At the black door, the gray-jacket man handed the key-clerk a small slip.
The clerk didn't open. He asked one question:
"Where's the validation mark?"
The gray-jacket man answered, "Shen's mark follows."
The clerk shook his head. "No mark, no door."
The gray-jacket man's face didn't change, but his fingers tightened against the board edge. He didn't argue. He didn't leave. He simply waited outside the threshold.
Qin Zhao saw it clearly.
This door didn't open just because you belonged to the ledger office.Someone had to make your paper "valid," and only then would the door accept it.
He whispered, "This door isn't recognizing people—it's recognizing procedure."
Xu nodded. "Keep watching."
Not long after, Shen Weijun arrived.
Same clean blue gown, cuffs spotless, pace unhurried. He didn't explain anything. He drew the sheet from the gray-jacket man's stack, glanced once, and placed a short validating mark at the end.
Only then did the key-clerk open the door.
Not wide—only a slit.
The gray-jacket man went in first.Shen Weijun followed.The door closed immediately.
Three steps. Nothing more:
Present the paper.Add the validating mark.Open the door.
Qin Zhao carved those steps into memory.
Now he understood why Xu Jinghong wasn't rushing to seize the gray-jacket man.
Seize him and you cut off one hand.Recognize this door and you find the place where a hand becomes a blade.
"Do you see it now?" Xu asked.
Qin Zhao nodded. "I do."
"Say it."
He compressed what he'd seen into one sentence, as she had taught him:
"The main entrance is for outer-hall people.""The black door is for inner-office paper.""No validation mark, the door doesn't open.""Shen Weijun isn't the hook-writer—but he's the one who gets paper through the door."
Xu looked at him. For the first time her gaze held a thin thread of approval.
"Almost," she said. "Add one more line."
"The black door also recognizes cargo. Charcoal, water, food, seal paste—everything goes through there."
Qin Zhao froze for a beat.
"Why?"
"Because inner-office work requires eating, heat, light, and paste." Xu's voice stayed low. "A door is dead. People defend against people. Cargo moves—cargo is the easiest thing to mix into."
Qin Zhao felt his pulse jump.
"You're going to enter through deliveries."
Xu didn't answer directly. She asked him instead, "Which delivery is easiest?"
Qin Zhao thought. "Food."
"Why?"
"Food has to be hot.""Guards don't dare delay it. If it turns cold, the people inside will curse."
This time Xu actually nodded.
"Right.""Charcoal can wait. Water can wait. Paper can wait.""Food can't."
She lowered the brim of her hat a fraction and dropped her voice further:
"Tonight, we recognize the second thing.""Who delivers food, when they deliver, and how many portions they carry."
Qin Zhao asked, "And after we recognize it?"
Xu answered flatly.
"After that—we go in."
They were about to leave when the black door opened again.
This time it wasn't the gray-jacket man, and it wasn't Shen Weijun.
A junior clerk came out hugging a narrow wooden tube, tied with red cord.
He didn't go toward the main entrance, and he didn't return to the ledger office. He headed straight toward the military supply transfer office.
Qin Zhao recognized the tube at once—it matched the one he'd seen before.
He breathed, "A detention list?"
Xu didn't answer immediately. She watched the tube for one full beat and then said only:
"If it's not a list, it's a draft.""Either way, it's something meant to press people down."
She watched it disappear and finally spoke the day's logic all the way through:
"The hook-writer sits at the desk.""Shen Weijun is the one who gets paper through the door.""And the door that sends the blade outward is this black door."
"We're not seizing one person now.""We're prying this door open—by a slit."
(End of Chapter.)