The Last Guide

Chapter 1: The River's Edge

The humidity hit Sarah Hendricks like a wall the moment she stepped off the twin-prop Cessna onto the cracked tarmac of Novo Airão's municipal airstrip. She'd been to the Amazon three times before—twice for conferences in Manaus, once for a brief field study near Tefé—but this was different. This time she was going somewhere the tourists didn't venture, where the rivers narrowed to channels barely wider than a boat, and the nearest hospital was a three-day journey through water that could kill you in a dozen ways before you reached it.

She adjusted her field bag on her shoulder and scanned the small crowd waiting beyond the chain-link fence. Fishermen in sun-bleached caps, a woman selling bottled water from a cooler, two children chasing a mangy dog through the dust. And there, leaning against a rusted pickup truck with his arms crossed, was the man she assumed must be Marco Estrada.

He was younger than she'd expected from his correspondence—early thirties, maybe, with the lean, weathered look of someone who'd spent most of his life under an unforgiving sun. Dark hair curled beneath a faded baseball cap, and a thin scar traced the line of his jaw from ear to chin. He watched her approach with eyes that gave nothing away.

"Dr. Hendricks?" His English was accented but clear.

"That's me." She extended her hand. "You're Marco?"

He shook it once, briefly, then reached for her equipment case without asking. "This everything?"

"There's another bag. Medical supplies."

He nodded and gestured toward the truck. "We leave in twenty minutes. The river won't wait."

Sarah had dealt with taciturn guides before. In her experience, the best ones often were—men and women who'd learned that the wilderness demanded attention, not conversation. But something about Marco's clipped manner felt different. Not unfriendly, exactly. More like guarded.

She climbed into the passenger seat while he loaded her gear into the truck bed. Through the dusty windshield, she could see the Rio Negro in the distance, its dark waters gleaming like oil in the afternoon light. Somewhere beyond that vast expanse lay the Jauaperi tributary, and beyond that, the remote stretch of flooded forest where the boto vermelho—the Amazon's pink river dolphins—had been spotted in unprecedented numbers.

This was her chance. Three years of grant applications, two rejected proposals, and countless nights poring over satellite imagery had led to this moment. The dolphins she sought were among the least studied cetaceans on Earth, and if her theories were correct, the Jauaperi population represented a distinct genetic lineage that had never been properly documented.

Marco slid into the driver's seat and turned the key. The engine coughed twice before catching.

"You've worked this region long?" Sarah asked as they pulled onto the dirt road leading toward the river.

"Long enough."

"The researchers at the station—Dr. Carvalho's team—they recommended you specifically. Said you knew the Jauaperi better than anyone."

Marco's jaw tightened almost imperceptibly. "I know it."

"How many expeditions have you led up there?"

He was quiet for a moment, eyes fixed on the road ahead. "Enough to know what to avoid."

Sarah waited for elaboration that didn't come. She'd learned over years of fieldwork that pushing too hard too early rarely yielded results. Better to let trust build organically, to prove herself capable before expecting openness in return.

The drive to the river took fifteen minutes over roads that had clearly never seen pavement. By the time they reached the small dock where Marco's boat was moored, Sarah's teeth ached from the jarring ride. But all discomfort faded when she saw the vessel that would be her home for the next three weeks.

It was a traditional wooden riverboat, maybe forty feet long, with a covered deck and a small cabin toward the stern. The hull had been painted blue once, though sun and water had faded it to something closer to gray. A hammock hung beneath the canopy, and fishing nets were coiled neatly near the bow.

"She's called Esperança," Marco said, following her gaze. "Hope."

"She's beautiful."

Marco's expression softened slightly—the first hint of warmth she'd seen from him. "She was my father's. He built her himself, forty years ago."

"He taught you to navigate?"

"He taught me everything." The warmth vanished as quickly as it had appeared. "We should load up. I want to clear the main channel before dark."

They worked in efficient silence, transferring Sarah's equipment from truck to boat. She was impressed by Marco's care with her instruments—the hydrophones, the sampling kits, the waterproof cases containing her laptop and satellite phone. He handled everything as though he understood its value, asking only once which items were most fragile.

By the time they cast off, the sun had begun its descent toward the tree line. Sarah stood at the bow as Marco guided the Esperança into the current, watching the town of Novo Airão shrink behind them until it was swallowed by the endless green.

The Amazon at dusk was a symphony of sound and color. Macaws wheeled overhead in bursts of scarlet and gold. The water itself seemed alive, its surface broken by the occasional splash of fish or the sinuous movement of something larger beneath. In the distance, a family of giant otters played in the shallows, their barking calls echoing across the water.

Sarah felt the familiar tightening in her chest that always accompanied the start of fieldwork—that mix of anticipation and uncertainty that reminded her why she'd chosen this life. Her colleagues at Cornell thought she was crazy, venturing into such remote territory with minimal support. Her ex-husband had called it a death wish, though that had been about more than the expedition.

But standing here, with the wind carrying the scent of rain and river and green growing things, Sarah knew she was exactly where she needed to be.

Marco appeared beside her, offering a thermos of coffee. "Three days to the station," he said. "Maybe four if the water's low."

"And the dolphin grounds?"

"Another day beyond that. The flooded forest—the igapó—it's hard to navigate. Many channels that look the same. Easy to get lost."

"But you know the way."

He took a long sip of coffee before answering. "I know a way. The forest changes every season. Every flood brings new paths, buries old ones." He paused, staring out at the darkening water. "That's the thing about the Amazon, Dr. Hendricks. Just when you think you understand it, it becomes something else entirely."

Sarah studied his profile in the fading light. There was something in his voice—a weight that seemed to go beyond philosophical observation.

"You can call me Sarah," she said.

He nodded once but didn't return the invitation to familiarity. Instead, he turned back toward the wheel. "You should rest. Tomorrow we enter the Jauaperi. The river will demand your full attention."

Sarah watched him go, then settled into the hammock with her field notebook. As the stars emerged overhead and the jungle's nocturnal chorus began, she recorded her first observations of the journey. The water temperature, the wildlife spotted, the coordinates of their camp.

She did not record her growing sense that Marco Estrada was a man carrying secrets. That would come later, when the weight of those secrets threatened to drown them both.