Read Chapter 4: The Algae Map

She spread the logbook on the galley table, weighting the curling pages with a chipped coffee mug and her father’s old brass compass. The storm had passed, but the boat still breathed beneath her, a slow creak of timber and tide. Morning light cut through the porthole, catching the fine grain of the paper.

The last entries were dated three weeks before his fall. Her father’s handwriting—tight, methodical, the small letters of a man who didn’t waste ink—filled the margins with observations. *Green tide at Plage du Guesclin. Density high. Wind from the NE, three days.* Some pages had pressed seaweed samples, brittle as dead skin. Others had small ink sketches of the coastline, the kind of careful rendering she remembered from the margins of his old sailing charts when she was a girl, watching him work at the kitchen table.

She turned the page and stopped.

It wasn’t a log entry. It was a map, hand-drawn across two full pages, the coast of Saint-Briac and its neighbouring headlands inked in fine blue lines. The harbour, the point at Le Bec, the long curve of the bay. And across it, in red—her father never used red—a scatter of small X marks, clustered and dated. Beside each cluster, a circled number. She recognised the dates. 2008. July, August, September, the summer of the great blooms. But the marks didn’t sit near the river mouths or the farm drainage channels. They sat along the open shore, following a line like a seam.

At the bottom of the page, in smaller, hurried letters: *check the outflow at low tide.*

She sat back. The boat shifted on its mooring, a gentle tug against the rope. Yann had said he wanted new data. He had said the old surveys didn’t tell the full story. But her father, fifteen years ago, had been drawing a different story entirely—one that nobody had listened to.

She folded the map carefully, tucked the logbook under her arm, and stepped out onto the deck. The harbour was waking. A gull stood on the railing opposite, watching her with one yellow eye.

Yann was in the boatyard office when she found him, bent over a spreadsheet on a cluttered desk. He looked up as she filled the doorway, and for a moment his expression was unguarded—curious, almost warm. Then he straightened and leaned back, arms crossed.

“Changed your mind about the mooring line?”

“I need to show you something.”

She laid the logbook on the desk, open to the map. He didn’t touch it. He looked at it for a long moment, his jaw tightening slowly, the way a man does when he recognises something he’d rather not.

“Where did you get this?”

“Under the floorboards. There’s a compartment in the cabin. Fifteen years of observations.” She tapped the red marks. “He was tracking the blooms, but not where the official surveys tracked them. The dates match 2008. But the locations are all along the open shore, away from the bay and the farms.”

Yann put his palms flat on the desk and leaned over the map. He traced the line of Xs with one finger, not touching the paper.

“Where’s the outflow he mentions?”

“I don’t know. I haven’t found it yet.”

He was quiet for a moment. Then he pulled open a drawer and slid out a printed chart, the official 2008 algae survey, the same one she’d seen pinned at the research station. He laid it beside her father’s map and spread them open. The official chart showed dense bloom concentrations hugging the coast near the river mouth, the output of the farms, the runoff from the mainland fields. Her father’s red marks sat miles away, around the headlands, where the water ran deep and clean.

“Your father wasn’t a scientist,” Yann said quietly. “But he spent forty years watching this coast. He knew it better than anyone I’ve ever met.” He looked up at her. “And this map is better than anything we’ve got. More accurate than the government data. More detailed than our survey proposals.”

“So why didn’t anyone listen to him?”

Yann’s mouth thinned. “Because he was a houseboat owner with a notebook. And the people who fund these studies need conclusions that match their budgets.” He pushed back from the desk, ran a hand through salt-stiff hair. “He came to us last year, actually. Tried to raise a flag. The project director at the time wouldn’t return his calls.”

She felt a small, sharp turn in her chest. Her father had never told her about that. Had never told her much at all, not about Marianne, not about the survey, not about fighting the current alone in his old boat while she built billboards in Paris.

“I want you to help me run a new survey,” Yann said. “Fieldwork, along the shore. I can get access to the research station’s equipment. You know the coast from your childhood. You know your father’s system.”

“I’m not a surveyor.”

“You don’t need to be. You need to steer a boat and take notes. That’s all this is. Two people, a few days, checking some of the spots he marked.” He gestured at the map. “If he was right, this could change everything we know about the blooms. About the bay.”

She thought about the letter in the drawer. Marianne. The unfinished words. Her father’s secrets were all leading somewhere, and she was standing at the centre of the trail.

“How much would you pay?”

Yann blinked. “I’m sorry?”

“The survey. If I help you, you help me. My father’s boat needs a new engine alternator, and I don’t have cash for that kind of work.” The lie was smooth enough, mostly true. The alternator was real. The reason she needed the cash was bigger: the lawyer in Paris had sent a third notice, her abandoned apartment lease bleeding penalties through an automated system that didn’t care about burnout or grief.

Yann studied her. “You’d be doing this for money?”

“I’m not doing it for nostalgia, Yann. My life is in Paris. I have a job. I have a lease.” The last word nearly snagged in her throat. “I just need to get this boat into saleable shape. If you need a deckhand, that’s fine. But I don’t work for free.”

He held her gaze for a long moment. For a second, a different expression flickered across his face—something like disappointment, but weighted, carrying the memory of a boy who’d waited alone by the shore. Then he nodded.

“Five hundred for the week. Cash. Plus fuel.” He pulled a pen from behind his ear, clicked it once. “We start tomorrow at low tide. You know how to handle your father’s boat?”

“I know how to handle his boat,” she said. “I don’t know if it can handle starting.”

“We’ll find out.” He looked back down at the map, and she watched his finger trace the line of red marks again. “The outflow at low tide,” he said, half to himself. “I think I know where that is.”

She gathered the logbook, closed it carefully against her chest. On the threshold, she paused.

“Did you know him? My father? Before all this.”

Yann’s hand stopped on the desk. “Everyone knew your father,” he said, his voice even. “He was the only man in this village who talked to the tide.”

She opened her mouth to ask what that meant, but he was already turning back to his spreadsheet, and the moment folded closed like a page.

Outside, the harbour air was sharp with salt and diesel. She climbed back aboard the *Anne-Marie* and knelt at the floorboard, pushing the logbook back into its compartment. Her fingers brushed against something she hadn’t felt before—a folded piece of paper, wedged beneath the rim. She pulled it out.

It was a receipt from a pharmacy in Dinard, dated two days before the storm. The name on it was her father’s. But the item listed wasn’t rope or chain or servicing.

It was a prescription for sleeping pills. Twenty tablets. And scrawled beneath the printed text, in the chemist’s rushed hand: *For M. Please deliver to the flats.*

She folded the receipt slowly, folded it again, and sat back on her heels with the cold paper pressed against her palm.

M. *For M.*

Marianne was real. And whoever had stood on the boat two days before her father died had known it.