Read Chapter 6: Fisherman's Debt

The knock came at the door just as Isla finished logging the day’s telemetry data. Three hard raps, the kind that meant business and bad weather both. She glanced at the clock—half past nine, the sky already a bruised purple over the Sound of Harris. Tam sat by the window, his reflection ghosting against the glass, his fingers absently tracing patterns she recognized from the pendant’s spiral.

“Expecting someone?” she asked.

He shook his head but didn’t meet her eyes. Since the fish, since the song, he’d been like that—watchful, coiled, as if waiting for a verdict he already suspected.

She opened the door to Angus MacNeil.

He stood on her threshold with his oilskins dripping, a corded net bag slung over one shoulder. Up close, his face was all hard cuts and weathered seams, the kind of face that didn’t soften for anyone. Behind him, the tide was going out, the stony beach gleaming wet under the last light.

“Dr. MacRae,” he said, not a greeting but an address.

“Angus.” She kept her voice even. “It’s late.”

“Aye.” He stepped past her without asking, his boots leaving damp prints on her floorboards. His eyes found Tam instantly, and something in them shifted—not fear, exactly. Recognition.

“You’ve kept him here,” Angus said, jerking his chin at Tam. “You shouldn’t have.”

Tam rose slowly from the window, his posture careful, unthreatening, but his hands had curled at his sides. “Do I know you?”

“No,” Angus said. “And you won’t need to. I’ve come to take you off the island. Tonight, if the tide allows.”

Isla moved between them, her spine straightening. “You don’t get to decide that. He’s under my care.”

“He’s not a patient, Doctor. He’s a debt.” Angus pulled off his sou’wester, and his thinning hair stuck up in gray spikes. In the low light, his eyes looked almost bruised. “Twenty years ago, I pulled a seal from my net. But she weren’t a seal when I cut her free. She was a woman, with hair like black water and eyes that knew me better than I knew myself.”

The room went very quiet. Somewhere beyond the window, a gull cried once, then stopped.

“Selkie,” Tam said. The word came out flat. He’d heard it enough now.

“She thanked me,” Angus continued, as if Tam hadn’t spoken. “Said her kind weigh debts heavy. Said one day, a life would come due—not mine, but taken in my name. She told me to watch the shore.” He looked at Isla, and there was something raw in his face, something that cracked the hard shell of him. “I’ve watched for twenty years. Nothing ever came. I thought perhaps she’d forgotten, or that the debt had passed with the telling.”

“And now you think Tam is the payment?” Isla’s voice was sharper than she intended. “That’s folklore, Angus. That’s—superstition.”

“That’s *debt*,” Angus said. “And I’ll not have his blood on my conscience because a mainland scientist thinks she knows better than the sea that raised us.”

Tam stepped forward. Not aggressive—just present. “You want to give me to this… Him of the Waves? Like a tithe?”

“I don’t want to do anything,” Angus said, and his voice cracked on the last word. “But I’ve seen what happens when a selkie’s debt goes unpaid. She told me. A life for a life, or the sea takes more than one. It takes the village. It takes the whole shore.”

“You said her kin would come for a life,” Isla said. “Her kin. If the song means anything, if the fish mean anything, then Tam isn’t coming *from* the sea. He’s being *called back* to it. Perhaps he’s the one who’s owed, not the one who pays.”

Angus shook his head slowly. “You’re twisting it to fit what you want, Doctor. But the sea doesn’t bargain. It collects.”

“He’s not leaving.”

The words came from Tam.

Isla turned. His face had gone pale, but his eyes were bright—almost luminous in the dim room. His jaw was set with something that wasn’t quite human certainty. “I remember nothing of who I was,” he said quietly. “But I know I did not come here to be handed over like salvage. If the sea wants me, it can come and take me itself.”

The air felt wrong after he spoke—too still, too charged. The lights flickered once, and the pendant in Isla’s pocket grew hot against her thigh, a warning she didn’t need to see to feel.

Angus stared at Tam for a long moment, then let out a breath that seemed to hollow him. “You think you can defy it.” He laughed, but there was no humor in it. “I’ve seen the markings on your skin, boy, even if you haven’t. You’re already halfway gone. The sea has your name in its mouth.”

“What markings?” Isla demanded. “Angus, what do you mean?”

But Angus was already moving toward the door. He paused at the threshold, one hand on the frame, and looked back at Tam with something almost like pity.

“I came to do right by the debt,” he said. “But you’ll not be saved by refusing it. You’ll only be taken slower.” Then his eyes found Isla. “Find his skin, Dr. MacRae. Find it before the next full moon, or the sea will stop asking.”

The door closed behind him. The sound of his boots faded over the stones, swallowed by the incoming tide’s low hiss.

Isla stood frozen, her pulse loud in her ears. Her hand went to her pocket, where the pendant had gone cold again, inert as a dead star.

“Isla.”

Tam’s voice was strange. Thick. She turned.

He had slumped against the wall, both hands gripping the edge of the table. His face was sheened with sweat, and his eyes were wide, unfocused. A tremor ran through his frame, visible even in the low light.

“Tam?” She crossed to him in two strides, reaching for his shoulder. “Tam, what’s happening?”

He opened his mouth to answer, but no words came—just a shuddering exhale, and then his body arched violently, spine bending backward as a seizure ripped through him. His head struck the floorboards with a sickening crack as he fell, and Isla dropped to her knees beside him, rolling him onto his side, one hand cradling his skull, the other pressing down against his shaking chest.

“Tam. *Tam.*” Her voice was sharp with panic, useless, and she knew it.

His eyes were open but not seeing—fixed on something far beyond the roof, beyond the dark, beyond the land itself. His lips moved, forming words she couldn’t hear.

And as she held him, as the tremor passed in waves and his body slowly stilled, she saw it.

Fine, silver lines were rising across his forearms. Not scars. Not light. Scales. Delicate as fish skin, banked in rows like a herring’s flank, gleaming faintly in the lamp glow as they surfaced from beneath his human pallor.

Isla’s breath caught. Her fingers hovered over them, unwilling to touch, unable to look away.

The seizure passed. Tam’s eyes cleared slowly, glassy and exhausted. He blinked up at her, and his first coherent words came in a whisper that seemed to echo from somewhere far deeper than his chest:

“She’s singing again. But she’s not calling me *back*, Isla.”

He swallowed, and his next words changed everything.

“I think she’s calling me *home*.”