The rain came on a Thursday and didn’t stop until Saturday night. It wasn’t the kind of rain that made people run inside. It was the kind that sat on the roof and tested every nail, every seam, every promise you made when you built something. On the forty-eight floors above, the rain ran down the sides and people watched it from windows. On the ground, behind the buildings, the rain sat. And the ground remembered it was mud.By Friday morning the patch where the three houses and the shelter stood was no longer dirt. It was a shallow, sucking field. The kind that pulls at your boots and laughs when you try to run. House one had a puddle inside by the door. House two’s floor was damp halfway across. The shelter had sunk two inches on the north side and now the roof tilted like it was listening to something. The old woman in house one sat on her cot with her feet pulled up. She had lived on floor nine for six years. The stairs hurt her knees. The rain didn’t. “Up there the

Five houses made people believe. Six houses made City Corp nervous.The morning after house five was finished, Aaron woke to the sound of hammering. Not from the Row. From above.Someone on floor twenty-two was tearing out a wall. Someone on floor thirty-one was moving furniture. And at the base of the tower, three families were standing by the stairs with bundles, looking down at the patch behind the fence.Word travels faster than concrete.The first challenge of house six was space. The Row was running out of it. House one sat near the fence. House two sat next to it. House three, four, and five filled the middle. That left one thin strip of ground between the cistern and the wire. Maybe eight feet wide. Maybe less.“Not enough for a house,” the carpenter said, measuring with his daughter’s string. “Enough for a home,” the carpenter’s daughter said. She was eleven and had opinions.Aaron looked at the strip. The ground sloped there. Water would run right through it when

Seven houses filled the Row. House eight meant they had to build on air.Not real air. Just air above the ground. Because the only space left was the step.The boy’s drawing was right. There was a spot near the cistern, but it dropped six inches down to where the water ran when it rained. If they built on the ground, the first storm would take it.“So we build up,” Aaron said on the morning they started. “Not a tower,” the carpenter said quickly. “One step. That’s all.”That was challenge one: building up without becoming what they hated.They didn’t use machines. They didn’t pour concrete. They used stone. Flat stone from the quarries. They laid them like a path, then another layer, then packed mud between. It took four days to make a platform three feet high and wide enough for one house. “It looks like a stage,” Null said. “It is,” the man who used to be the boss said. “A stage for a door.”Challenge two was the cold. The first real winter hit in the middle of week

They didn’t tell City Corp about the door. Not yet.Telling meant forms. Telling meant inspectors. Telling meant someone else deciding what the ground was for. And the ground had just decided it was theirs.So for three days, the Row acted normal. Water was boiled. Roofs were patched. Kids learned letters on house three’s wall. Above, the camera blinked. Below, the door waited.On the fourth night, Aaron took the map out.It wasn’t a full map. It was a piece of one. The part under their block. Tunnels like veins. Rooms marked with small squares. Arrows pointing north, south, to the burnt market, to the old laundry, to places that didn’t exist anymore on the surface.“There,” Null said, pointing with a dirty finger. “That’s us. Right here.” She tapped the spot under house five. “And this,” she dragged her finger, “goes to the market. That’s maybe twenty minutes if you don’t run.”The man looked at it for a long time. “Up there I knew every floor plan,” he said. “Down he

The power stayed on. The water came back. And for six days, City Corp did nothing.That was how Aaron knew something was wrong.Because when City Corp did nothing, it meant they were doing something somewhere else.On day seven, the young man with the machine came back. Alone. No tablet. No coat. He walked past the eight houses. Past the bench. Past the covered door. He stopped at the bench and sat down. “Can I talk?” he asked. Aaron sat next to him. “I’m not here as City Corp,” the man said. “I’m here as me.” “Okay.” “They found the old plan,” the man said. “The one from 12 years ago. ‘Clear ground level.’” Aaron didn’t react. “It’s still active,” the man said. “It never got canceled because no one ever built anything here. Until you.” “What do they want?” “Time,” the man said. “30 days. To decide what to do with this block.” “30 days to clear us?” “30 days to decide if clearing you costs more than leaving you.”He stood up. “I’m not supposed to tell