“Well, it has been tampered with,” said Mark. “We will need a correct one.”

“Maybe Diana could get us one,” Julian said, reaching for a pad of paper and a pencil. “Or we could ask Malcolm.”

“Or check out what’s at the Shadow Market,” said Emma, and grinned unrepentantly at Julian’s look. “Just a suggestion.”

Mark glanced at his brother, and then the others, clearly worried. “Was that helpful?” he said. “Was it a thing I should not have said?”

“Are you sure?” said Ty, looking from the map to his brother, and something in his face was open as a door. “That the map is incorrect?”

Mark nodded.

“Then it was helpful,” said Ty. “We could have wasted days on a map that was wrong. Maybe longer.”

Mark exhaled in relief. Julian put his hand on Mark’s back. Livvy and Dru beamed. Tavvy was looking out from under the table, clearly curious. Emma glanced at Cristina. The Blackthorns seemed to be wound together by a sort of invisible force; in that moment they were completely a family, and Emma could not even mind that she and Cristina were on the outside.

“I could attempt to correct it,” said Mark. “But I do not know if I have the skill. Helen—Helen could do it.” He glanced at Julian. “She is married, and away—but I assume she will return for this? And to see me?”

It was like watching glass shatter in slow motion. None of the Blackthorns moved, not even Tavvy, but blankness spread over their features as they realized exactly how much it was that Mark did not know.

Mark paled and slowly set the core of his apple down on the table. “What is it?”

“Mark,” Julian said, looking toward the door, “come and talk to me in your room, not here—”

“No,” Mark interrupted, his voice rising with fear. “You will tell me now. Where is my full-blood sister, the daughter of Lady Nerissa? Where is Helen?”

There was an achingly awkward silence. Mark was looking at Julian; they were no longer standing beside each other. Mark had moved away, so quietly and quickly Emma had not seen it happen. “You said she was alive,” he said, and in his voice there was fear and accusation.

“She is,” Emma hastened to say. “She’s fine.”

Mark made an impatient noise. “Then I would know where my sister is. Julian?”

But it wasn’t Julian who answered. “She was sent away when the Cold Peace was decided,” Ty said, to Emma’s surprise. He sounded matter-of-fact. “She was exiled.”

“There was a vote,” said Livvy. “Some of the Clave wanted to kill her, because of her faerie blood, but Magnus Bane defended the rights of Downworlders. Helen was sent to Wrangel Island to study the wards.”

Mark leaned against the table, his palm flat against it, as if he were trying to catch his breath after being punched. “Wrangel Island,” he whispered. “It is a cold place, ice and snow. I have ridden over those lands with the Hunt. I never knew my sister was down there, in among the frozen wastes.”

“They would never have let you see her, even if you had known,” Julian said.

“But you let her be sent away.” Mark’s two-colored eyes were flashing. “You let them exile her.”

“We were children. I was twelve years old.” Julian didn’t raise his voice; his blue eyes were flat and cold. “We had no choice. We talk to Helen every week, we petition the Clave every year for her return.”

“Speech and petitions,” Mark spat. “Might as well do nothing. I knew—I knew they had chosen not to come for me. I knew they had abandoned me to the Wild Hunt.” He swallowed painfully. “I thought it was because they feared Gwyn and the vengeance of the Hunt. Not because they hated and despised me.”

“It wasn’t hate,” said Julian. “It was fear.”

“They said that we couldn’t look for you,” said Ty. He had taken one of his toys out of his pocket: a length of cord that he often ran through and under his fingers, bending and shaping it into figure eights. “That it was forbidden. It’s forbidden to visit Helen, too.”

Mark looked toward Julian, and his eyes were dark with anger, black and bronze. “Did you ever even try?”

“I won’t fight with you, Mark,” Julian said. The side of his mouth was twitching; it was something that happened only when he was deeply upset, and something, Emma guessed, that only she would notice.

“You won’t fight for me either,” Mark said. “That much is clear.” He glanced around the room. “I have come back to a world where I am not wanted, it seems,” he said, and slammed his way out of the library.

There was an awful silence.

“I will go after him,” Cristina said, and darted from the room. In the soundlessness left by her departure, the Blackthorns looked at Jules, and Emma fought the urge to run to put herself between him and his siblings’ pleading eyes—they looked at him as if he could fix it, fix everything, as he always had.

But Julian was standing very still, his eyes half-closed, his hands twisted into fists. She remembered the way he had looked in the car, the desperation in his expression. There were few things in life that could undo Julian’s calm, but Mark was, and had always been, one of them.