Chapter 72: The Cut Face

The tide had already begun coming in by the time Carrick led them into the refuge at the rear of the cove. Ruth carried two small tins wrapped in clean cloth, with forceps and paper packets tucked beside them. Carrick had borrowed a narrow chisel from one of the rescue crews.

Rafael kept the refuge map under his coat. Leo carried a hammer that looked too ordinary for the amount of attention everyone gave it.

Carrick stopped at the edge of the inner shelf. "The shelf stays intact."

Leo checked the boards, the stone beneath them, then the wall beyond. "Agreed."

"No cutting into the working surface."

"We won’t."

"And if there isn’t a safe place?"

Leo rested the hammer against his leg. "Then we leave without a sample."

Carrick nodded once and stepped aside. Severin had come ready for an argument and found none.

Rafael opened the map over one of the dry boards. Their previous marks crowded the inner cavern in pencil, with the pale formations sketched separately because they refused to line up neatly with anything else. Ruth’s drawing from Jonah’s hand sat folded inside his field book.

"First one," Leo said.

They moved toward a pale branch running down the wall beyond the treatment shelf. From several paces away it seemed promising, broad enough to scrape without touching the boards and close to one of the earlier temperature marks.

Armin crouched before anyone reached for a tool. He ran two fingers along the darker rock above the pale line, then followed the damp trace downward.

"No."

Leo waited.

"Water comes through that crack. Maybe every high tide, maybe only after rain, but enough." Armin pointed higher. "Look at the edge."

A thin crust had gathered below the crack and spread across part of the pale formation.

Rafael leaned closer. "Salt?"

"Could be salt, or whatever the water carries out of the rock." Armin stood. "Take a piece here and we spend the next week arguing about what washed over it."

Severin glanced at the tins in Ruth’s hands. "That would be a bloody useful week."

Ruth gave him a brief smile. "You can write the reports."

"Then definitely not."

Rafael marked the rejected point with a small cross and added a note beside it before Leo moved them farther in. The second candidate sat nearer Jonah’s old position. Pale material had gathered along a shallow break in the wall, and one of the earlier thermal marks lay close enough to make Severin look twice.

Leo did not touch the hammer. He crouched, followed the fracture with his fingertips, then turned toward the shelf. "Carrick." The doctor came over.

Leo pointed to the fracture. "This line continues behind your working edge."

Carrick studied the crack. "How far?"

"Can’t tell without opening it. That’s the problem."

Severin saw where the fracture vanished beneath the section Carrick used to brace one of the treatment boards.

Leo stood. "We leave this one alone."

Carrick followed the fracture toward the shelf, then nodded. "Good."

Rafael drew another cross. The sea struck beyond the first turn, and water pushed farther over the lower rock near the entrance. Ruth glanced back before following them toward the inner wall.

"Plenty of time," Carrick said.

Leo turned toward the entrance. "Tell me when that changes."

The third place was less impressive. A narrow pale projection crossed darker stone at shoulder height, no wider than two fingers for most of its length. It sat away from the treatment boards, inside the broader area Rafael had marked from their earlier work.

Severin took the field book from him. Jonah’s position lay down and to the left, with the warmer section extending past it. Leo’s strange readings wandered farther than both, while the pale branches crossed only part of the same ground.

He unfolded Ruth’s sketch. The closed shape in Jonah’s sample was smaller than the branch on the wall, but both split around an empty space before joining again.

"This one’s inside all of it," Severin said.

"Inside enough of it," Rafael corrected.

Severin handed the book back. "You know what I meant."

"I do. I still have to write it down properly."

Rafael checked the map again. "Neither of our strongest readings is here. The temperature point’s farther in, and Leo got his strongest result somewhere else." He noted beside the mark that this was the controlled sample, with the stronger readings elsewhere.

Carrick looked from the map to Leo, who nodded toward the selected patch. "We can cut here without wrecking the site. Use this one."

Armin checked the wall above and below the projection for visible seepage. He found damp stone farther down but no obvious wash crossing the selected point. Leo inspected the cracks around it, then tapped the handle of the chisel lightly against the wall and listened.

Leo pointed to a patch smaller than Severin’s thumbnail. "There."

Ruth unwrapped the tins. The surface sample came away with almost no effort as Leo scraped a dusting from the weathered face with the chisel edge. Ruth caught the pale grit and darker grains on clean paper, then tipped them into the first tin while Rafael wrote the location and time.

"For the deeper piece," Leo said, "nobody leans on the wall."

Severin and Carrick moved back. Leo placed the chisel at the edge of the pale projection and gave it one controlled strike. A flake broke away cleanly, leaving a fresh cut no wider than a fingernail in the pale projection.

Leo set the hammer down and studied the broken face. The weathered surface had been pale and chalky in places, but beneath it the material was denser, with thin bands of color running through the fresh face.

Carrick took the chip with forceps and turned it once in the lantern light. "That isn’t like the piece from Jonah."

Ruth leaned closer. "Too hard?"

"For one thing."

Severin studied the chip and felt no relief at the difference.

Leo glanced toward Rafael, who kept writing.

By the time they climbed back across Grayhook, the tide had covered the lowest stones in the cove. Severin spent most of the walk trying not to decide what the difference meant.

Back in Carrick’s workroom, the specimens went onto the table before anyone offered a theory. The three small dishes from the day before were still labeled in Rafael’s hand. Ruth added two more, marking them Surface scraping and Deeper refuge chip.

Carrick started with the superficial scraping. It broke down into grit mixed with salt-like crystals and darker fragments that looked close enough to ordinary stone for him to stop there. The deeper chip resisted the needle. Carrick tried the edge with forceps, then compared it directly with the remaining pale material from Jonah.

"This is much harder," he said. "There’s more mineral in it, I think."

Rafael lifted his head. "Same material?"

"No."

Carrick set the chip beside Jonah’s sample. "Jonah’s piece was fibrous and soft enough to separate. This isn’t. Whatever those drawings have in common, these aren’t the same material."

Rafael wrote it down. Side by side, the two samples were less alike than the drawings had suggested.

Ruth picked up the deeper chip. "We compared the outside."

Carrick glanced at her. "And the broken face."

"No, I mean we compared what they feel like. What they’re made of." She reached for the small lens case beside the microscope. "Yesterday we were looking at the pattern."

Severin leaned against the edge of the table. "Where it split and joined."

Ruth nodded. Carrick considered the chip, then shifted the microscope toward her. "You’ll need something thinner than that."

Ruth worked at the fresh fracture with a needle until a tiny flake separated from one edge. She set it on the glass and adjusted it twice before looking through the eyepiece. For several seconds she said nothing. Carrick waited beside her.

"Well?" Severin asked.

"Give me a moment."

She moved the slide. "Most of the surface grit’s gone. This bit came from the fresh break underneath." Ruth adjusted the focus. "There are lines inside it."

Rafael stopped writing.

Carrick took her place at the microscope and moved the slide by fractions without speaking. "Channels, maybe, or boundaries between deposits. I can’t tell from this." He straightened.

Ruth returned to the eyepiece. Severin could hear the clock on Carrick’s wall between the small sounds of the microscope. "There," she said.

Carrick bent beside her rather than taking the seat back while Ruth touched the pencil to paper and began to draw what she saw. A narrow line entered from one side and divided. Its branches curved apart around an empty patch before joining again.

Rafael pulled the earlier drawing of Jonah’s sample from his field book and placed it beside the new one.

Carrick compared the two drawings. "Same arrangement. That’s all we can say."

Ruth nodded, still watching the slide. "Wait." She loosened the clip holding the fragment and turned it carefully until the broken edge faced the light.

The line that formed one side of the loop reached the fracture. Ruth shifted the focus down the broken face.

The pale branch continued through the depth of the chip.