“Knew it?” Hiram snorted. “Girl, I slept warmer inside a coal bank shack than I ever did in my brother’s fancy clapboard house. Stone don’t care about fashion. That’s why fools distrust it.”
Elsie stepped closer. “So this could work?”
“Anything can fail if built stupid.” Hiram tapped the drawing with one bent finger. “But this? This is not stupid.”
He could not lift beams, but he could see a crooked line from twenty paces. He knew how wet mortar should feel, how smoke behaved before it became dangerous, and why drainage was a religion whether people admitted it or not. He returned the next day with chisels, two plumb lines, and a sack of iron hinges he claimed had been “annoying his shed.”
In April, another helper came.
Her name was Beatrice Ward, though everyone called her Bea. She was a widow with broad shoulders, sharp eyes, and a way of speaking that made politeness feel unnecessary. Her husband had died three winters earlier when their barn roof collapsed under wet snow. Since then, Bea had repaired everything herself because depending on pity had proven less reliable than a good mallet.
She watched Mara and Elsie work for nearly an hour before speaking.
“I didn’t come to encourage you.”
Mara wiped sweat from her brow. “Why did you come?”
“To find out whether my husband died because weather is cruel or because we built like idiots.”
Nobody said anything for a moment.
Then Mara handed her the notebook.
Bea read for a long while. When she finished, her face had gone very still.
“Show me the raised floor,” she said.
So Mara did.
She explained the crossbeams, the gap beneath, the way cold traveled through solid contact, the need for still air, the reason the fireplace had to be massive instead of pretty. She explained how the cave’s constant temperature would not heat them by itself but would keep winter from stealing every bit of warmth they made.
Bea listened with the intensity of a woman hearing a confession from the dead.
At last she said, “Most houses are just boxes begging the wind to be kind.”
Hiram, sitting on a stone, grunted approval.
By June, the cave had a floor frame.
By July, the sisters and their helpers had laid thick planks over the beams, tight enough that crumbs would have trouble finding a crack. The first time Elsie walked across it in stocking feet, she laughed aloud. It was such a startled sound that Mara turned quickly, thinking she had hurt herself.
“It doesn’t feel like stone,” Elsie said.
“No,” Mara replied. “It feels like ours.”
The front wall rose in August.
They cut logs from the slope, peeled them, notched them, and set them beneath the overhang. They packed gaps with clay, straw, ash, and pine pitch. Hiram insisted every joint be tested twice. Bea insisted they build a storage bench under the window because “survival is easier when you have somewhere to put beans.” Elsie carved small marks into the inside of the doorframe when Mara was not looking: one line for each week they had not quit.
The accident came in September.
They were lifting a heavy beam into place above the doorway when one of the temporary braces slipped. The beam lurched. Elsie, standing too close, lost her balance and fell backward toward the stone ledge.
Mara moved without thought.
She caught her sister around the waist and twisted hard enough to throw them both sideways. Elsie landed on Mara instead of the rock. The beam crashed down where Elsie’s head had been.
For several seconds, nobody breathed.
Then pain exploded through Mara’s ribs.
Bea was beside them first.
“Elsie?”
“I’m fine,” Elsie gasped.
“Mara?”
Mara tried to sit and failed. The world narrowed to white sparks.
Hiram cursed in a low, ancient voice.
Bea pressed careful hands along Mara’s side. “Cracked rib, maybe two. Not broken clean through. You’ll breathe angry for a month.”
Elsie burst into tears. “We should stop. Mara, we should stop. This place almost killed you.”
Mara lay on the floor they had built and stared at the unfinished doorway.
“No,” she whispered.
Elsie wiped her face with both hands. “How can you say that?”
“Because falling timber almost killed me. Not the cave.”
“That’s not enough difference.”
“It is exactly the difference.” Mara forced herself to breathe shallowly. “People die in barns, churches, kitchens, and beds. That doesn’t make shelter the enemy. Bad building is the enemy. Carelessness is the enemy. Quitting just because Caleb Crowe is waiting to be right is the enemy.”
Elsie knelt beside her, shaking.
“What if he is right?”
Mara turned her head and looked at her sister.
“If we stop now,” she said, “then he won’t have been right. We will have made him right.”
The next morning, Elsie tightened the brace herself.
By November, the house under the mountain was almost ready.
The fireplace took longest.