Chapter 1

The harbor was black glass under the dock lights.

Mara Landry moved through the half-light with the steadiness of long practice, carrying each piece of equipment as if it already belonged to a place in her hands. The waterproof survey tablet went into its bracket on the console. The mesh bag of dive gear settled by the stern. Dry bag. Thermos. Sandwich. Tide table printout folded once and slid into the nav pouch. She checked each latch after it was closed. Checked the fuel cap with two fingers. Checked the tie-down on the spare tank. Her hands did the work without wasted motion.

The marina had not committed to morning yet. The sky over Shelter Cove was the color of wet slate, light gathering behind it but not through. Two fishing boats were already beyond the breakwater, their running lights small and steady in the outer dark. Everything else was still.

She stepped onto the Datum, weight low, one hand on the rail though she did not need it. Eighteen feet of rigid inflatable, scarred tubes, reliable outboard, deck scrubbed clean enough to show where old salt had dried in white maps. She ran the departure check in sequence. Fuel full. Radio live. Engine started on the first crank and settled into a clean idle. Running lights green, red, white. She listened to the engine for ten seconds longer than necessary, hearing for irregularity and finding none.

At the bow, she untied the line, coiled it, stowed it. At the stern, the same. Before she cast off, her right thumb moved across the glass face of the analog depth gauge on her left wrist. Old rubber strap. Fogged edge under the crystal. Faded bezel markings. She did not look at it. The touch was enough.

Then she backed the Datum out of the slip and eased toward the harbor mouth.

Inside the breakwater the water was flat and dark, carrying the dock lights in long trembling columns. Outside, the Pacific lay open and gray-blue and patient. The smell changed as she cleared the harbor—less diesel, more kelp and raw salt, the cedar of the pilings gone behind her. She pushed the throttle forward. The bow lifted. The hull came onto plane.

The shore began to recede.

Mara drove at a steady fifteen knots, not pushing the boat harder than the chop warranted. The swell was low, one to two feet at most, long-period and easy. Late September. Between seasons. The kind of morning people called forgiving because nothing in it looked sharp. She read the water anyway. The surface texture shifted where the current met the swell. A darker band to the south suggested colder upwelling. She adjusted course by degrees, eyes moving from the channel markers to the water ahead to the horizon and back.

The tide table printout fluttered once in the nav pouch. The date showed before the wind pressed it flat again.

September 22.

She did not look at it a second time.

By the time the harbor was a dark notch in the land behind her, the light had strengthened enough to separate ocean from sky. The coast to the east resolved into headlands and low bluffs, the coves between them still full of shadow. Ahead, there was nothing visible yet but the subtle change in water that told her where Pinter Rock waited below the surface. The swell steepened there, lifting and folding differently over the submerged granite. She saw it before the chartplotter would have mattered.

Forty-five minutes from the harbor, she throttled back.

The sea around the shoal had a different color. Green under the morning light where the reef rose close beneath the surface. Beyond it, deeper blue. She brought the Datum around to the eastern side where a sandy channel cut between rock ridges and dropped the Danforth anchor. Let out rode. Backed down against it. Felt the line come taut. Counted to thirty with the engine in reverse. The boat held. She checked the set again. It held again.

Then she killed the engine.

Silence came down at once. Not empty silence. Water against the tubes. The low wash of swell over rock. Wind moving lightly offshore. No human sound anywhere.

She stood still for a moment with one hand on the console, listening to the ocean continue without the engine under it.

Then she began to suit up.

The wetsuit went on in its usual order. Legs first, then hips, then arms. She worked the zipper closed with the lanyard she had rigged for solo dives. Mask, snorkel, fins. Dive knife on the right calf. Survey tablet strapped over the left forearm. The depth gauge sat beneath it on her wrist, old and mechanical under newer instruments. Backup, she told people if they asked. No one usually did.

She looked once toward shore. A dark line four miles away. Close enough to seem possible. Far enough to be a fact.

Then she sat on the tube and slipped into the water.

Cold came up from her feet to her chest in a single clean band. Surface temperature in the high sixties. Cool, not dangerous. Not yet. She dipped her face, cleared the mask, set the snorkel, and looked down.

The shoal opened under her.

Granite ridges. Sand channels. Barnacle crust and anemones and purple urchins fitted into cracks no wider than a hand. Bull kelp rose from the deeper edges in long bronze columns, their blades streaming with the current. Blue rockfish turned in compact silver groups and broke apart around her shadow. A lingcod lay on a ledge the color of old stone, jaw set, not moving. The sun was still low enough that the light entered the water slantwise, falling through the kelp in green-gold shafts and laying itself across the sand in moving bars.

She descended at the first station, held position, checked the depth, logged the number. Bottom type. Kelp cover. Current strength. Surfaced, breathed, kicked to the next station.

The work was simple in the way repeated things become simple. Dive. Read. Log. Surface. Breathe. Move. Her body settled into the rhythm it knew. The tablet responded cleanly under her gloved finger. The positions matched the grid she had built over three years of work on this stretch of coast. Each station a point. Each point another small argument against uncertainty.

At Station 47 she dropped into a narrow sand channel between two rock ridges. The kelp above broke the sunlight into a shifting lattice that moved across her arms and face and chest. For a few seconds she forgot the tablet on her forearm. Forgot the next station. She hung there in neutral buoyancy and watched the light move over the white sand below.

Then her hand went to the screen. Depth 6.8 meters. Sand and rubble bottom. Moderate kelp cover.

She surfaced.

At Station 50 she noticed the analog gauge because the needle hesitated before settling, lagging a fraction behind the digital readout. Six point one meters. The small oscillation of the needle, then stillness. She touched the glass with one fingertip. The gesture slowed by the water looked gentler than it would have in air. Then she went on.

A harbor seal hauled itself onto the exposed edge of the shoal sometime after eight. By then the tide had dropped enough to leave a broad lip of barnacled granite above the waterline. The seal watched her with the incurious look of an animal that had already decided she was irrelevant. She logged its position in memory without deciding to.

By nine o’clock she was ahead of schedule. Stations completed cleanly. Five remaining.

She surfaced from the next dive and turned toward the Datum.

The water where the boat should have been was empty.

For a moment the eye refused it. She scanned left, right, back to the anchor line buoy that also was not there. Then the boat resolved two hundred meters away to the southeast, small and wrong, drifting broadside with the current. The anchor rode streamed behind it in a loose dark line.

Her body moved before the numbers did. She was swimming hard at once, driving with the fins, head low, arms deep. Fifty meters. A hundred. The boat still moved away, not quickly, not dramatically, just steadily at the speed the current had chosen. She lifted her head. The distance was not closing enough. She put her face back down and swam harder.

Eight minutes. Twelve. The boat was still out of reach, still sliding southeast on the surface as though on rails, shrinking by degrees too small to mark individually and impossible to mistake in sum. Her breathing turned ragged. The muscles at the base of her neck tightened. She did the math while swimming. Current roughly one and a half knots. Sustainable speed less than that. Maximum burst not enough for long enough.

She stopped.

Treading water, she watched the Datum go on without her. The hull caught the sun once and flashed. Then the angle changed and it was only a shape, and then a smaller shape. Radio, water, food, phone, first-aid kit, spare clothes, keys, engine. Everything useful arranged neatly on a drifting deck she would not touch again.

Mara turned back toward the shoal and swam.

The return took longer. She saved what she could on the way back, choosing efficiency over force now that force had failed. When she reached the exposed granite she hauled herself up with both hands, barnacles biting into her palms through the thin skin already softened by salt water. She stood on the highest point and breathed until the edges of her vision sharpened again.

The shoal around her was bare stone and tide pools. Nothing else.

She took stock.

Position fixed in her head to the meter. Distance to shore: four-point-two miles to the nearest land, more to a beach she could actually crawl onto. Low tide at 10:47. High tide at 5:12. Maximum exposure in less than two hours, then the rock would begin to disappear beneath her feet. Current running south-southeast now, expected to slack around one and reverse shoreward. Water temperature sixty-five to sixty-eight at the surface. Wetsuit three millimeters. Thigh abrasion on the right leg, superficial. Energy loss from the sprint for the boat significant. No drinking water. No food.

The plan formed where fear would have gone.

Wait for the current shift. Rest. Conserve heat. Enter on the favorable flow. Swim west-northwest. Adjust for drift. Reach shore by dusk if the body held.

She crouched and scraped a flat place among the barnacles with the tip of her dive knife, enough room to sit without cutting through the wetsuit seat. Wet her hair. Checked the abrasion. Four inches, outer thigh curving toward the knee, upper skin layers gone, clear seep with diluted blood. Painful. Manageable.

A tide pool near her left boot held a small orange sea star, bright against the gray stone. Tube feet worked slowly along the submerged face of the rock, each one gripping and releasing in patient sequence. Mara watched it longer than she needed to. Her thumb settled on the depth gauge glass again, pressing without thought.

The tablet still worked. Position confirmed. Battery fifty-eight percent. Moisture ghosting faintly at the screen edge under the housing.

She looked west toward the shore. From here it was still just land, not destination. A dark line under a whitening sky.

The rock would be larger for another hour. Then smaller. Then gone.

Mara sat with her back to the sun and waited for the tide to turn.