Suuqai's man arrived during the second watch.
Batu was still awake, seated at the low table inside his tent. Orel had brought him a supply allocation discrepancy before the evening meal, and Batu still hadn't found a clean solution for it. Too many requests had been routed through the eastern stores at the same time. If he approved one set, another would fall short by morning.
The knock came while he was still reviewing the figures.
Batu set the document aside and opened the tent flap.
The messenger stepped inside just far enough to hand over a sealed piece of felt. He said nothing. Batu recognized Mersek's unit seal immediately.
That changed the problem.
Batu broke the seal and unfolded the message.
It was short. Six lines written in the formal Uighur administrative script used by Jochid officers for official correspondence. The handwriting was careful, measured, the sort of script a man used when he wanted a document to survive inspection.
Batu studied that before he studied the contents.
A hurried man normally wrote in shorthand. Faster. Less precise. Mersek hadn't done that. Which meant the materials had been prepared ahead of time. The formality wasn't habit. It was concealment. He wanted the letter to look routine if someone intercepted it before it reached its destination.
The contents confirmed the rest.
Temur's situation was under review. The chain was compromised. The recipient was to disappear until further instruction arrived.
Batu read the letter a second time, testing the wording for anything hidden beneath the obvious meaning. He found nothing new.
"Where was the rider intercepted?"
"Eastern gate." The messenger kept his hands behind his back. "He cleared the inner perimeter and was heading toward the northeastern road. One of Suuqai's men on the outer rotation noticed the timing."
Batu thought about that.
Second watch. The exact stretch when the overnight guard rotation shifted and the camp's coverage weakened for a few minutes.
Mersek knew the schedule because he'd delayed implementation of the revised rotations himself ten days earlier. At the time it had looked administrative. Now Batu saw the advantage it created.
So this hadn't been improvised tonight. Mersek had prepared the route in advance in case he ever needed it.
"Keep the rider isolated from the general holding," Batu said. "Tell Suuqai I want Mersek brought to me before morning watch."
The messenger bowed once and left.
Batu sat again with the felt letter in front of him and worked through the implications.
A formal message sent during second watch meant Mersek had acted the moment the rumor about Temur reached him. No delay. No attempt to verify it further. No effort to wait until morning and judge the political response.
That kind of speed mattered.
A cautious man reacted that quickly only when he'd already decided what conditions would force movement.
Mersek had been waiting for this.
And the fact that the message was traveling east matched what Batu had suspected ever since he'd reviewed the operational log.
He placed the felt letter beside the logbook, extinguished the lamp, and slept.
Mersek arrived before dawn with one of Suuqai's men following two paces behind him.
He entered the tent, saw the materials on the table, and understood immediately why he was there.
Interesting. No hesitation.
Mersek sat without invitation and read the evidence in order. First the felt letter. Then the operational log from the Tergesh preparation, opened to the attendance record and the marked notation Batu had identified earlier.
He took his time with both.
Finally he looked up.
"How long?"
Batu answered the real question instead.
"The road passage clause. Kirsa told me the rider who reached the Khotor knew it. You were the only council officer present when that clause was discussed outside the formal summary."
Mersek's expression barely shifted. "That's circumstantial."
Batu let his eyes rest on the felt letter.
After a moment Mersek looked at it too. His jaw tightened slightly before the expression disappeared again.
It was the first visible crack Batu had seen in him.
Careful men could maintain composure for years. But they also recognized the exact moment when denial stopped helping them.
"What happens now?" Mersek asked.
Batu had already decided that.
"Your unit folds into Torghul's command. Your men receive reassignment orders with no explanation attached. Beginning tomorrow, you report directly to Suuqai's security detail."
He let the next part sit between them for a moment.
"Your movement is limited to the camp perimeter until I decide otherwise."
Mersek absorbed that in silence. Batu watched him measure the damage. Not to himself first, interestingly, but to the structure around him.
"My men," Mersek said at last. "Will they be told anything?"
"No."
Mersek nodded once and stood.
At the tent entrance he paused. Not fully turned back, but enough to speak clearly.
"I wasn't working against you," he said. "I maintained a connection that would keep my clan viable if eastern pressure increased."
His voice stayed level now that concealment no longer mattered.
"When Ogedei dies, Guyuk will move. Whatever follows that, my clan needed to appear on the correct lists when the succession settles."
A brief hesitation.
"I didn't know about the assassination attempt until afterward."
Batu studied him.
That part was probably true.
"I know."
Mersek left with Suuqai's man.
Batu remained at the table and tested the explanation against the evidence he already had.
The logic fit.
A man passing supply intelligence and movement reports eastward wasn't necessarily trying to destroy the camp. He could simply be building leverage. Maintaining ties with whichever eastern faction survived the succession struggle.
That matched Mersek's behavior better than ideological betrayal did.
The assassination contract tied to Guyuk had moved through Temur using a separate channel entirely. Mersek's role looked narrower now. More defensive than aggressive.
The distinction mattered.
It changed the scale of the threat.
It did not change the fact that Mersek could no longer remain in his current position.
Outside, the camp was beginning to wake. Batu could hear movement near the horse lines and the shift change among the overnight watch.
He kept the felt letter for his private records, returned the operational log to the archive stack, and left to find Torghul before the morning meal.
The transfer process took forty minutes.
Torghul asked only two questions, both practical. Unit composition. Existing assignments. Nothing else.
That told Batu enough.
Torghul had worked with him long enough to recognize the pattern. A command structure receiving a unit without its commander meant the explanation already existed whether spoken aloud or not.
Batu was crossing the central ground afterward when he noticed movement near the administrative tent.
Siban's aide.
The man was walking slightly faster than the rest of the morning traffic. Not enough to draw attention from most people. Enough for Batu to notice.
Batu considered following him, then rejected the idea. Better to watch the result first.
He moved instead to the supply rack beside the eastern granary and waited.
Ten minutes later the aide emerged from the administrative tent and headed back toward the eastern officer quarters.
Khulgen exited shortly afterward and crossed the camp toward Batu.
"Siban's aide requested permission to move the departure to today," Khulgen said. "He claims Siban received word that the Irtysh border detachment requires his attention sooner than expected."
"What kind of word?"
"He didn't say."
Of course not.
Batu looked toward the eastern officer quarters.
Siban had originally planned to remain in camp longer. That meant he had been gathering information. Watching. Reconsidering conditions before returning northeast.
Now he was leaving early.
And the explanation he provided was operational rather than personal, which made it difficult to challenge without creating unnecessary friction.
That choice alone revealed caution.
"Approve it," Batu said. "Standard departure provisions. Two days of supply from the eastern stores."
Khulgen nodded and returned toward the administrative tent.
Siban would leave camp carrying one important piece of information: Mersek had disappeared from the internal structure overnight.
Whatever conclusions Siban had built from the camp's earlier alignment were now obsolete.
That would force him to recalculate.
Batu preferred that outcome to detaining him. A man adjusting incomplete information often revealed more than a man held in place.
He was still watching the eastern quarters when Orel appeared beside him wearing the expression of someone who had delayed an interruption until it became unavoidable.
"Yusuf is at the gate," Orel said. "He arrived this morning. Says he has a counter-proposal regarding the river route terms."
Batu considered that.
A merchant returning with a counter-proposal instead of an acceptance meant Yusuf had spent the intervening days calculating leverage. He believed he had identified terms worth bargaining from.
Which meant the negotiation was entering its useful stage.
Batu glanced once more toward the eastern gate.
"Bring him to the command tent," he said. "Give me an hour."