“My patience is gone,” he said.
The car went quiet except for crying.
Mason stepped into the aisle between him and Grace. Ranger took his place half a stride ahead, ears forward, body low.
The man’s gaze flicked to the dog and then to Mason. “You have no idea how expensive the last ten minutes have been.”
Mason said nothing.
“You think this is about her?” The man laughed once, short and airless. “She’s packaging. That’s all.”
Grace flinched at the word. Mason did not look back, but his shoulders changed. The threat in him became so controlled it seemed to cool the air.
“You’re done,” Mason said.
The man smiled. “Not without what I came for.”
His name was Derek Voss, though Grace would not hear it until hours later in a federal building where the coffee tasted like metal and no one used their first names. On the train, he was only the man with the dead eyes and the gun.
He moved deeper into the car, keeping the weapon low enough not to panic himself and high enough to make every passenger understand. He had lost the clean plan. Grace could see that now, even through fear. His polished calm had begun to crack around the edges.
“You’re going to step aside,” Derek told Mason. “Then you’re going to keep that dog under control while I remove a piece of medical equipment that doesn’t belong to her.”
“It belongs to her,” Mason said.
Derek’s mouth tightened. “You military types get sentimental at the dumbest possible times.”
Mason’s hand remained near his own concealed weapon, but he did not draw. Too many passengers. Too narrow an aisle. Too many shaking bodies in the wrong places.
Derek seemed to understand the same geometry. His eyes searched the car, and when he saw that Mason would not give him an easy shot, he reached for leverage.
He grabbed the woman in scrubs from the seat nearest him.
She was middle-aged, with tired eyes and a Pittsburgh hospital badge clipped to her backpack. Grace had noticed her earlier because she had been reading with a nurse’s concentration, one finger holding her place while the train rocked. Now Derek hauled her into the aisle by the collar and pinned the gun near her cheek.
The woman made one small sound, more surprise than scream. Her paperback dropped under the seat.
“Weapon down,” Derek shouted. The calm was gone from his voice. “Dog down. Now.”
A low moan moved through the car. Grace pressed both hands over her mouth. She wanted to apologize to the nurse, to everyone, for being the reason terror had landed in their row, but the thought was irrational and she knew it. Knowing did not stop the shame.
Mason did not lower his eyes from Derek’s face.
“Let her go,” he said.
“You don’t give instructions anymore.”
Mason’s left hand moved slowly away from his jacket. Derek’s gun jerked toward him.
“Careful.”
“I’m being careful,” Mason said.
He reached into the pocket of his field jacket and withdrew a small black cylinder. Not a weapon Grace recognized. He let it fall into the aisle, where it bounced once and rolled near Derek’s shoes.
Derek glanced down.
That glance was all Mason needed.
The cylinder flashed to life with a burst of white strobing light so violent that half the car cried out and turned away. Derek flinched, his face twisting as the pulse hit his eyes. The nurse ducked instinctively, and in that same broken second Mason made a soft clicking sound with his tongue.
Ranger did not run straight up the aisle. He went over the seats.
The shepherd sprang from the floor to an armrest, then across the back of a row, silent and sure-footed in the flashing light. He came at Derek from the side, low and fast, avoiding the nurse with the precision of an animal trained to make impossible choices under pressure. He struck Derek’s gun arm, and the weapon clattered loose.
The nurse dropped to the aisle and crawled away sobbing.
Derek hit the floor hard, Ranger above him, teeth fixed in cloth and flesh just long enough to immobilize him. Mason closed the distance in three strides, kicked the gun under a seat, and drove Derek onto his stomach. A plastic restraint snapped around Derek’s wrists before he had enough breath to curse.
“Ranger, release.”
The dog let go at once and backed away, though his eyes never left Derek.
For a moment, the train car seemed unable to believe it was still standing. People remained crouched on the floor, staring from Mason to the dog to the three restrained men. The emergency lights hummed overhead. Outside, blue and red flashes had begun to flicker faintly between the trees.
Grace heard them before she understood what they were. Sirens, distant but closing.
Mason came back to her and crouched beside her seat. “The engineer must have gotten a distress call out. Help is here.”
Grace could not stop shaking. “Is it over?”
“The immediate part.” He looked at her left brace. “I need to remove the device before you’re mistaken for part of this. Once federal agents see classified material inside your medical equipment, the first assumption will be ugly.”
“I didn’t know,” she said.
“I know.” His voice was firm enough to make her look at him. “Ranger knew, too.”
The dog had returned to her side. He pushed his head beneath her hand as if putting her fingers where they belonged. Grace held on.
Mason opened a compact multitool from his pocket. “I’m only touching the brace,” he said. “Tell me if I hurt you.”
She nodded.
He worked by the light of a small penlamp, peeling back a strip of rubberized coating along the outer titanium support. Grace watched his hands. They were scarred, blunt, and steady. Nothing about the moment felt clinical, yet there was a care in the way he handled the brace that made her throat tighten. He treated it like part of her, not like luggage.
After a minute, he found the hidden screw.
“Whoever did this had proper tools,” he said. “This wasn’t done in a garage.”
“Dr. Whitaker,” Grace whispered. “He told me he was making the brace stronger.”
Mason’s jaw flexed, but he kept working. Three turns of a miniature driver released a narrow panel no wider than two fingers. Inside the hollowed support, wrapped in antistatic film, sat a small black drive with no logo, only a laser-etched serial number and a federal inventory marking half-scraped from one edge.