The story begins on a Friday evening at the Market Arms in Abergavenny, late in the summer of 1969. A warm, cosy place where men gathered in cliques, leaning over their pints, sharing secrets. Others laughed in loose, easy bursts.

Cigarette smoke hung in thick, soft layers beneath nicotine-stained yellow lamps. The familiar scent of spilt ale and seasoned wood swirled silently around the drinkers, picking up other, less identifiable sweet and not-so-sweet smells. It was a male haunt. A refuge where time slowed, where the talk ranged wide, and the real world remained beyond the bar door.

Old Mr Evans, a retired military man, held his customary court near the settle with his countryside friends. He had fished the River Grwyney, which flows down from the Grwyney Reservoir high in the Black Mountains, long before most of the men in that room had learned to knot a shoelace. His hands were thick, gnarled, and skilled. He leaned over his pint and announced that the river had gone strange. The trout were not rising. The water felt wrong. He had found a footprint in the soft mud near an alder root that bothered him. Narrow and worn at the edges, it could have been a man’s boot, he said. A few men nodded at once. The angling club still believed it guarded the river as a church guards its relics.

Mention poachers, and that old sense of duty stirred at once.

I listened quietly, wondering if Dai would hear this gossip on the wind. He always did. Rumour moved through him the way weather moves across a hill — part of the natural order of things.

On Saturday morning, I made my way along his usual path. Past the great oak. Left at the broken gate. Across the rutted track by the Dragons Head. Then on along the edge of the porker field where the air always carried the stench of pigs and swill. Dai’s directions were often a recipe for getting lost. When I reached his patch of hazel and birch, he was already waiting. His hands were in his pockets. His jacket had weathered to the colour of old bark.

I told him what Mr Evans had said. He gave a dry snort.

“Evans sees plenty,” he replied. “He just never sees the right thing.”

He walked into the undergrowth without another word. He moved with the confidence of a man at peace with briar, root, and slippery mud. I followed.

The River Grwyney is heard first as a hiss of water washing stone. Through the birches, it shone like a silver tongue.

At the bank, Dai crouched and touched a narrow scrape in the mud. Mr Evans had been right about one thing. Something had passed that way.

“This might be his poacher,” Dai said, squinting at the mark. “Take a proper look.”

The print was slim and long, narrowing at one end. Not the tread of a boot — though in the soft mud it could easily have fooled someone. The edges were worn and blurred by water and passing animals. Dai tapped the mud lightly with a finger. “Otter prints are rare here,” he murmured. “You wouldn’t spot one unless you knew what to look for. Most folk would swear it was a boot skid.” He traced the outline carefully. “A young one,” he said. “He has been running this stretch at dawn. That is what pushed the trout down. Not a man with poaching intentions.”

I asked if he would tell Evans. Dai shook his head.

“The river tells its own stories, be it truths or lies. People hear what they want to hear when they’re ready to listen.”

He reached into his coat and brought out a small wooden box. Inside lay a spool wrapped with dark sheep wool. A fine gut line threaded through it, ending in a barbless hook touched with a sliver of worm.

“You’ll not find this in any modern book,” he said. “A yarn-spinner trap. The trout mistake it for a drifting tuft of fleece. Sheep lose more wool to the wind than shepherds care to admit, and the river gathers what the hedges let slip.”

He set the box on a flat stone. The wool sat softly upon the current, turning slowly where the water touched it. We waited in the undergrowth. A heron flew upstream, its slow wings making the sound of heavy cloth flapping in the wind. The sky above carried a faint brown haze from the coal fires in town, yet here at the river all was clean.

The wool trembled. A faint shiver, nothing more. Dai moved before I knew there was anything to see. He lifted the line in a clean, quiet motion. Up came a bright brown trout, thick-bodied and freckled with red. He slipped it into a damp sack.

“We take three,” he said. “No more. A river teaches a man his manners.”

Two more fish came in the same still way. The wool drifted. The sun glanced off the water. Dai’s hands worked with the unhurried precision of a kingfisher.

After catching the third brownie, he packed away the yarn-spinner and stood ready to go. “Otter will pass through again tonight,” he said. “It is good for the river. A place without its hunters grows careless.”

The walk back took us through bracken and sheep paths. Now and then, the Gavenny showed itself in silver flickers between the hedges. Dai stopped once, hands on hips, looking down a long bend in the water.

“People always chase the trout,” he said. “They forget the river. Look after the river first. The trout and otters will follow of their own accord.”

Dai cooked the catch that evening on his old outside stove. The pan was black with years of smoke. The trout crisped in the heat, their skins curling at the edges. As we ate, the wood settled around us. A tawny owl called across the hillside, although it seemed to come from roots rather than branches.

In the quiet that followed, it struck me that what Dai did was not poaching, not in the way Mr Evans imagined it. It was living with the river — a long conversation between land, water, and a man who spoke their language of patience, observation, and respect.

He made sure the countryside benefited from his presence.