"Then ask one thing at a time. I'll answer what I can, and tell you when I don't know."
He gave her the outline of North Basin without making himself a hero. A woman named Lucía Herrera had died after an accident on a stormy runway. The records of earlier warnings had been incomplete. He had challenged a public account he believed was wrong and lost his job. He had also stopped pursuing parts of the dispute when their family needed stability.
"Did you lie?" Mina asked.
"Not in my statements. But I kept quiet about things I could still have pushed to investigate."
"Why?"
"Because your mother was sick, because we were scared, and because I thought I'd already lost the chance to change anything. None of those reasons erase the choice."
A group of travelers passed with matching baseball caps. Mina lowered the phone until they were gone. "Did the people who got hurt know you tried?"
"Some did. Not all."
"What about Lucía's family?"
"They know there were unanswered questions. I don't know whether they want to hear from me now. We shouldn't assume."
The answer bothered Mina because it denied her the comforting ending of an easy reconciliation. But it felt more real than the stories in which one phone call fixed every wrong.
Adrian held a printed email up to the camera. It was from Priya Desai, confirming that a city archive had identified duplicate dispatch recordings under an old municipal equipment inventory. The files had not yet been authenticated for a formal inquiry. They were promising, not conclusive.
"A reporter wants to talk," he said. "A lawyer wants to reopen the case. But none of that is your burden. You came here to show your invention."
"My invention is about records."
"That doesn't mean you owe the world your childhood."
"I know. I just don't want to pretend I didn't see what happened."
He nodded slowly. "Then we'll find a way for you to be heard without making you responsible for everyone else's decisions."
Ms. Dawes returned with two bottles of water and gave Mina a moment to end the call. They boarded the hotel shuttle together. Out the window, Washington unfolded in rectangles of light, roads Mina had never traveled, and buildings where people were still arguing over a woman's final shift. The city seemed vast and strange, but she was not alone inside it.
"One thing at a time," Mina whispered, repeating her father's words. She set the cardboard tube across her knees and held it securely as the shuttle turned toward the conference district.
CHAPTER TEN
Two Conferences
The hotel room was small, with a desk barely wide enough for Mina's tablet and model streets. Adrian arrived early the following morning after an overnight flight, looking tired but grateful to see her. He hugged her for a long moment before helping lay out her presentation supplies while she brushed her teeth. The map tube contained three printed panels, each marked with colored dots representing reports of inaccessible crossings. The model itself was built from cardboard, glue, and a generosity of imagination. Mina loved it because it made the invisible logic of her code visible to people who had never written a line.
Her teacher had sent fourteen encouraging messages, none asking about the flight. Mina answered the latest with a photograph of the exhibit materials. Ms. Dawes replied: Excellent. Remember to eat breakfast before you try to improve civilization.
Adrian laughed when Mina showed him. It was his first easy laugh in hours.
Ms. Dawes had left a breakfast tray outside their door. They sat at the desk sharing warm rolls and fruit. The television remained off. Adrian asked her to walk through her presentation once, as she would for the judges. She explained how Common Ground invited residents to record problems, how multiple reports could be compared, and why an uncertain report remained visible as uncertain instead of disappearing.
"What if someone lies?" Adrian asked in his judge voice.
"Then one report isn't treated as proof. The system asks for other observations, checks time and location, and lets a moderator mark disputes. Nothing is deleted just because it's inconvenient."
He nodded. "That's a better answer than some institutions I've worked for."
"Dad."
"Sorry. I'm listening."
They finished the rehearsal without discussing North Basin again. Mina slept badly, but she slept. In the morning, the conference center smelled of coffee, new carpet, and rain-wet coats. Students had brought everything from low-cost water testers to miniature greenhouse roofs. A boy from Vermont had built a device that counted migrating birds without photographing them. Two sisters from Arizona were demonstrating a cooling shelter that used recycled insulation.
Mina's nerves returned in a more welcome form. She was no longer afraid of Conrad Vale; she was afraid of forgetting a line she had practiced for months. When a judge approached, she straightened her poster and began.
"A map is a promise," she said. "It says that if you go this way, you'll get where you need to go. Common Ground is a way to let people tell us when that promise is broken."
The judge asked whether the system might expose the locations of vulnerable users. Mina explained the privacy safeguards she had built and admitted that further testing with community organizations was needed. Another judge asked how false reports were handled. She showed the verification workflow. A third asked why she had chosen bus stops as her first pilot project.
"Because my neighbor missed three medical appointments when the accessible route kept changing," Mina said. "The city's official map still showed a perfectly functioning stop."