One of the young men, to appear strong, walked up and kicked an elderly veteran sitting in a wheelchair, but when the bus driver saw all this, he went up to them, and what he did shocked everyone on the spot.

At 6:17 on a Thursday evening, the old man fell between the bus and the curb, and the three teenagers laughed as if gravity had chosen him for a joke.

Mara Ortiz saw it in the wide-angle mirror while easing Route 19 toward Hawthorn and Bell. She saw the aluminum cane skitter beneath the bench. She saw the man catch himself against the shelter wall with both hands. Most of all, she saw the way he refused to look at the teenagers.

The bus was still twenty yards from the stop. Mara hit the brakes hard enough to send a paper cup rolling down the aisle.

“Everybody stay seated,” she called, though no one had asked what was happening.

The doors folded open. Cold air rushed in, carrying the smell of wet pavement and fried onions from the corner market.

The tallest boy leaned over the old man. He wore a red varsity jacket with the name MERCER stitched across the chest.

“Come on, soldier,” he said. “Show us how you march.”

The old man’s right trouser leg was pinned neatly below the knee. A carbon-fiber prosthetic gleamed beneath it, scratched at the shin. His left hand trembled, but his voice did not.

“Give me my cane.”

The boy nudged it farther away with his sneaker.

“You can reach it.”

His companions laughed again. One was a broad-shouldered boy holding a phone vertically. The other, a girl with silver rings and a yellow raincoat, looked toward the street instead of the scene.

Mara climbed down from the bus.

“Back away from him,” she said.

The tall boy turned. He had a handsome, unfinished face, the sort that had not yet learned how much a smile could reveal.

“We’re just talking.”

“Then talk from over there.” Mara pointed toward the newspaper box. “Move.”

“This isn’t your business.”

“You made it my business when you blocked my stop.”

The broad-shouldered boy lowered his phone. “She’s recording us?”

“The bus is recording you,” Mara said. “And so am I.”

She was not. Her phone sat in the cab, but the lie landed. The tall boy’s eyes flicked to the black dome of the security camera above the windshield.

The old man reached for the cane. Mara got there first and handed it to him. His fingers closed around the rubber grip with careful precision.

“Can you stand?” she asked.

“I’ve done harder things.”

“That wasn’t my question.”

For the first time, he looked directly at her. His eyes were pale blue and startlingly alert.

“Yes,” he said. “With a minute.”

Mara turned to the teenagers. “Give him the minute.”

The boy in the varsity jacket stepped close enough that she could smell peppermint on his breath.

“You always stop for strays?”

The old man’s cane tapped once against the concrete.

“His name is Elias,” the girl in the raincoat said quietly.

The tall boy glanced at her. “Did I ask?”

“No.”

Something passed between them—fear, Mara thought, though she could not tell whose.

Elias pushed himself upright. The prosthetic made a faint mechanical click as it accepted his weight. He reached for the bench, then for the shelter pole, and finally stood without help.

“Thank you,” he said to Mara.

“Get on the bus.”

“I’m not going anywhere.”

“Sir, this bus is leaving in three minutes.”

“Not with them on it.”

The tall boy laughed. “We were here first.”

Mara looked down the empty street. “Then you have three minutes to find somewhere else to be.”

The boy in the varsity jacket lifted his phone again. “You can’t throw paying passengers off.”

“I can refuse service to anyone threatening another passenger.”

“We didn’t threaten him.”

Elias said, “You took my cane.”

The broad-shouldered boy’s face changed. It was slight, but Mara saw it. The words had made the moment real. Not teasing. Not a prank. A thing that could be described by people who wore uniforms and carried clipboards.

The tall boy shoved his hands into his pockets.

“Whatever. Let’s go.”

He started toward the corner. The broad-shouldered boy followed. The girl lingered.

“You should call someone,” she told Elias.

“I am,” he said.

She frowned. “Who?”

Elias looked at the arriving bus. “The person I’ve been waiting for.”

The girl glanced at the darkening windows, then hurried after the others.

Mara helped Elias onto the lift. He waved her off before she could touch him, and she respected the decision. He boarded slowly, seated himself in the first reserved spot, and tucked his cane between his knees.

The bus had nine passengers. A nurse in blue scrubs, two college students, a man asleep beneath a newspaper, and a mother with a little boy who was still wearing a paper crown from school.

No one spoke until the doors closed.

Then the nurse said, “Are you all right?”

Elias nodded. “I’m old, not breakable.”

Mara returned to the driver’s seat. Her hands were steady on the wheel, though her pulse was not.

She glanced into the mirror. The teenagers had disappeared around the corner. The girl in the yellow raincoat was looking back.

Mara pulled away from Hawthorn and Bell.

At the next red light, Elias leaned forward.

“Driver.”

“Mara.”

“Mara. Did your camera record the stop?”

“It records everything.”

“No,” he said. “It doesn’t.”