The south road offered no answer. It gave them rain, wheel ruts filling by slow degrees, and a dead alder with its bark stripped pale as bone.
Mara closed the ledger and buckled it beneath her coat.
"We go back," she said.
Pell was crouched beside one of the sleeping outriders, counting the man's breaths with two fingers laid against his throat. He did not look up. "Would returning improve the evidence, do you think?"
"It would improve my reach."
"Your aunt has already placed the estate under household guard."
"My aunt's household guard allowed a thief into my laboratory."
"Before or after it became illegal?"
Teren took the wet blanket Nella handed him and laid it over the outrider. His burned sleeve dragged across the mud. He had wrapped the worst of it with a strip torn from his shirt, badly but tightly. "If the page left before the raid, whoever took it has had time to leave the estate as well."
Mara turned on him. "And therefore we should obediently continue along the road selected for us."
"Therefore turning south may put us farther from them."
"An argument equally useful in every direction."
Caldus stood beneath the tilted carriage hood with the charter case hugged against his ribs. Rain had darkened the shoulders of his brown robe. "The treaty does not recognize usefulness as grounds for delay. It recognizes arrival, witnesses, signatures, seals, and bodily presence at the appointed boundary station before sunset on the third day. I mention this because bodily presence is often treated as optional by persons who have never authenticated a disputed marriage."
Nella wiped her knife on a tuft of sedge. "No one here is disputing the marriage yet, Brother. We're trying not to be smoked into a ditch before it can become properly miserable."
"Improper misery is not legally curative."
A horse coughed in the trees.
Every weapon came up except Mara's. Her hand went instead to the satchel at her hip, finding by shape the waxed packet of quickpowder and the squat blue bottle beside it. The rain smelled of trampled fern, wet leather, and the sour residue of the sleep-smoke. Beneath those lay another odor: horse sweat carried ahead of moving bodies.
Many bodies.
Teren stepped between Mara and the tree line.
He did it without reaching for her or ordering her down. That made it more difficult to resent.
Nella put two fingers in her mouth and whistled, three falling notes like a marsh thrush dying badly.
The answer came as two sharp clicks of the tongue.
"Rusk," she said. "Or someone who learned their noises."
Riders emerged among the birches in a loose file, grey cloaks soaked black at the hems. They did not keep to the road. They moved over roots and standing water with the casual balance of men who had spent more hours in saddles than beds. Short carbines rested across their thighs. Sprigs of yew were tucked into their hatbands, dark needles against pale felt.
The first rider was younger than Teren by several years and resembled him only where resemblance could become an insult. The same straight nose had been broken and allowed to heal crooked. The same dark eyes looked quicker to laughter, provided the laughter hurt someone. He wore no officer's sash. A forest knife as long as Mara's forearm lay across his saddle, and he was sharpening it while his horse picked its way through the mud.
He drew the stone once more along the blade before looking at Teren.
"You look married already," he said. "Wet, singed, and surrounded by witnesses."
Teren lowered his pistol, though not far. "Ivo."
"Brother."
The younger Rusk's gaze crossed Pell, Caldus, the drugged outriders and the carriage with its cracked wheel rim. It stopped on Mara's satchel.
"Which one of you brewed the fog?"
"The person who attacked us," Mara said.
Ivo smiled. "That narrows the forest to every widow with a kettle. You must be Veylan."
"You must be the reinforcement no one agreed to."
His smile remained, but one hand closed around the sharpening stone. "Teren said you were exact."
Mara looked at Teren.
"I said your chemistry was exact," he replied.
"A courtship distinction," Ivo said. "Write it into the charter."
Teren holstered his pistol. "How many?"
"Twelve with me. Eight more watching the peat crossing. We saw your smoke from Broken Heron Ridge."
"That was not our smoke."
"Smoke rarely takes sides."
Pell rose, brushing mud from his gloves finger by finger. "Commander Rusk, your arrival is timely. Inspector Odran Pell, Royal Office of Bounds and Assay. I believe your brother's message requested discretion."
Ivo turned the sharpening stone over. Its underside was stained reddish with steel dust. "What message?"
No one moved for the length of three raindrops striking the carriage hood.
Teren's face did not change. Mara watched his right hand instead. The thumb pressed once against the edge of his holster, testing leather that needed no test.
"The dispatch I sent from Veylan estate," he said.
"Didn't reach me."
"It left before dawn with one of your own couriers."
"Then he found a warmer command."
Ivo swung down from the saddle. He landed lightly and passed the forest knife to Teren hilt first. "Edge is poor. Your man at the south lodge has been using it to split kindling."
Teren accepted it automatically. His burned hand failed to close.
The knife dropped.
Ivo caught it before it struck the mud.
He did not look at the bandage. He sheathed the knife at Teren's belt, tugged the strap snug, and said, "You've made a dirty business of your sleeve."
"The message," Teren said.
"I had none. We were already riding west when the ridge watcher saw green smoke over Widow's Causeway."
Mara's fingers tightened around the blue bottle inside her satchel.
"It was grey," she said.
Ivo glanced at her. "What was?"
"The sleep-smoke. Grey with a white ground-hugging fraction. No green."
Nella had gone still beside the nearest horse. She looked north, toward a rise hidden by rain and pine.
Teren said, "Could you mistake the color at that distance?"
"My watcher can tell pine smoke from alder at five miles and a charcoal burn gone hot at seven. He said green. One column, three breaths long, from this side of the causeway. We took it for our distress signal."
"Your distress signal," Pell said softly, "is green?"
Ivo gave him a pleasant look. "It is today."
Mara pulled out the blue bottle. Teren's hand moved, then stopped before touching her wrist.
"What is that?" he asked.
"Copper wash."
She went to the carriage wheel. Rain had softened the mud around it, but the spokes still carried a crust of pale smoke residue where the cloud had rolled over them. She scraped a pinch into the bottle, stoppered it, and shook.
The liquid remained blue.
"No arsenical green," Pell said.
"Thank you, Inspector. I had feared the color might escape me."
She poured the test into the ditch. The diluted copper ran between black reeds like a strip of summer sky.
Ivo watched it vanish. "Then someone signaled us."
"Someone who knew you were close enough to see," Mara said.
"We weren't meant to be close."
"You were not summoned," Teren said.
The elaborate care had entered his voice. Fear, Mara thought, and disliked recognizing it so quickly.
Ivo bent to pick a burr from his horse's fetlock. "No."
"Why were you riding west?"
"Family business."
"You command my scouts."
"Our father's scouts. You inherit them after he dies, unless your new wife poisons the seating wine and improves the order of succession."
Mara recorked the bottle. "I would not use poison in wine. The taste is too difficult to conceal."
Ivo looked up at her, deciding whether she had made a joke. Teren did not. He took the bottle when she held it out, wrapped it in the square of dry cloth she indicated, and returned it to the exact pocket from which she had drawn it. He had watched her arrange the satchel once. He remembered the order.
That was an inconvenient skill in a man.
Behind them, one of the drugged outriders began to retch. Teren was beside him before Pell had finished turning. He rolled the man onto his side, cleared his mouth with two gloved fingers, and held him through the convulsion without looking toward Mara for instruction or praise. The outrider's boot hammered the mud. Teren braced the man's shoulder until it stopped.
"Breathing?" Mara asked.
"Yes. Shallow."
She knelt across from him and lifted the man's eyelid. The pupil shrank reluctantly beneath the grey light. "He will wake with a headache and the conviction that death would be quieter. Keep him on his side."
Teren shifted his knee deeper into the mud to support the man's back. "Can he ride?"
"Not without falling under the horse."
"Then he takes mine."
Ivo made a low sound. "We have spare mounts."
"He takes mine."
Teren unbuckled his cloak and folded it beneath the outrider's head. The motion pulled at the burn. His mouth tightened, nothing more.
Mara found herself watching his hands. One damaged, one steady. Neither idle.
She stood first.
Nella had crossed to the north verge. She crouched by a patch of rushes where the mud showed three separate sets of hoofprints leaving the causeway. One set went east into the birches. The others curved north.
"Your attackers?" Pell asked.
"Maybe. Maybe deer in cavalry boots." Nella pressed her thumb into the clean edge of a print. "Fresh enough. They split after the smoke."
"Can you follow them?" Ivo asked.
"I can follow a tax collector over bare rock if he's frightened enough. Doesn't mean I ought."
Caldus tapped rain from the charter case with increasing violence. "We have lost forty-one minutes to unconsciousness, interrogation, and equine observations. Vigil Nine remains north-northwest."
"Vigil Nine remains wherever the boundary station was when the charter was drafted," Nella said. "The river's moved twice since then."
"Rivers do not alter legal coordinates."
"They alter whether your boots fill with water."
Pell approached Mara, keeping his voice low. "Would the stolen correction permit green smoke?"
"With copper salts, yes. It would also make the mixture harsher and less reliable."
"So our thief might have signaled Commander Rusk."
"Our thief did signal him. The question is why."
Pell's expression softened into concern so practiced it might have been issued with his badge. "Would it ease your mind to know the commander and his men can now escort us?"
"No."
"Why not?"
"Because whoever arranged the attack knew where we would be, knew what smoke would disable us, knew Ivo Rusk was riding west without his brother's knowledge, and knew which signal would bring him here."
Ivo had heard. His hand stopped on his horse's bridle.
Teren rose slowly from beside the outrider. Mud covered one knee of his breeches. "Ivo. What family business?"
The brothers looked at one another across the sleeping man.
Rain ticked on carbines, buckles, the black lacquer of Pell's document box. Far off, from beyond the birches, a jay gave a harsh single cry.
Ivo pulled a folded strip of paper from inside his glove.
"At dawn," he said, "someone nailed this to the door of our forest lodge."
He handed it to Teren.
Mara saw the paper before the writing: heavy rag stock, one edge feathered, the other three cut with a fine blade. Along the lower margin ran a faint brown tide mark and a dusting of black grit caught in the fibers.
Laboratory ash.
Teren unfolded the strip. His eyes moved once across the line, then returned to the beginning.
He held it out to Mara.
The message was written in block capitals, without signature.
BRING RUSK STEEL TO WIDOW'S CAUSEWAY. MARA VEYLAN WILL NEED IT.