I felt like I could row forever—until Horace shouted from one of the other boats to ask how much ocean was left between us and the mainland, and Emma squinted back toward the island and then down at her map, measuring with spread fingers, and said, somewhat doubtfully, “Seven kilometers?” But then Millard, who was also in our boat, muttered something in her ear and she frowned and turned the map sideways, and frowned again, then said, “I mean, eight and a half.” As the words left her mouth, I felt myself—and saw everyone else—wilt a little.

Eight and a half kilometers: a journey that would’ve taken an hour in the stomach-churning ferry that had brought me to Cairnholm weeks ago. A distance easily covered by an engine-powered boat of any size. One and a half kilometers less than my out-of-shape uncles ran on odd weekends for charity, and only a few more than my mother boasted she could manage during rowing-machine classes at her fancy gym. But the ferry between the island and the mainland wouldn’t start running for another thirty years, and rowing machines weren’t loaded down with passengers and luggage, nor did they require constant course corrections just to stay pointed in the right direction. Worse still, the ditch of water we were crossing was treacherous, a notorious ship-swallower: eight and a half kilometers of moody, changeable sea, its floor fanned with greening wrecks and sailors’ bones and, lurking somewhere in the fathoms-deep darkness, our enemies.

Those of us who worried about such things assumed the wights were nearby, somewhere below us in that German submarine, waiting. If they didn’t already know we’d fled the island, they’d find out soon enough. They hadn’t gone to such lengths to kidnap Miss Peregrine only to give up after one failed attempt. The warships that inched along like centipedes in the distance and the British planes that kept watch overhead made it too dangerous for the submarine to surface in broad daylight, but come nightfall, we’d be easy prey. They would come for us, and take Miss Peregrine, and sink the rest. So we rowed, our only hope that we could reach the mainland before nightfall reached us.

*   *   *

We rowed until our arms ached and our shoulders knotted. We rowed until the morning breeze stilled and the sun blazed down as through a magnifying glass and sweat pooled around our collars, and I realized no one had thought to bring fresh water, and that sunblock in 1940 meant standing in the shade. We rowed until the skin wore away from the ridges of our palms and we were certain we absolutely couldn’t row another stroke, but then did, and then another, and another.

“You’re sweating buckets,” Emma said. “Let me have a go at the oars before you melt away.”

Her voice startled me out of a daze. I nodded gratefully and let her switch into the oar seat, but twenty minutes later I asked for it back again. I didn’t like the thoughts that crept into my head while my body was at rest: imagined scenes of my father waking to find me gone from our rooms on Cairnholm, Emma’s baffling letter in my place; the panic that would ensue. Memory-flashes of terrible things I’d witnessed recently: a monster pulling me into its jaws; my former psychiatrist falling to his death; a man buried in a coffin of ice, torn momentarily from the next world to croak into my ear with half a throat. So I rowed despite my exhaustion and a spine that felt like it might never bend straight again and hands rubbed raw from friction, and tried to think of exactly nothing, those leaden oars both a life sentence and a life raft.

Bronwyn, seemingly inexhaustible, rowed one of the boats all by herself. Olive sat opposite but was no help; the tiny girl couldn’t pull the oars without pushing herself up into the air, where a stray gust of wind might send her flying away like a kite. So Olive shouted encouragement while Bronwyn did the work of two—or three or four, if you took into account all the suitcases and boxes weighing down their boat, stuffed with clothes and food and maps and books and a lot of less practical things, too, like several jars of pickled reptile hearts sloshing in Enoch’s duffel bag; or the blown-off front doorknob to Miss Peregrine’s house, a memento Hugh had found in the grass on our way to the boats and decided he couldn’t live without; or the bulky pillow Horace had rescued from the house’s flaming shell—it was his lucky pillow, he said, and the only thing that kept his paralyzing nightmares at bay.

Other items were so precious that the children clung to them even as they rowed. Fiona kept a pot of wormy garden dirt pressed between her knees. Millard had striped his face with a handful of bomb-pulverized brick dust, an odd gesture that seemed part mourning ritual. If what they kept and clung to seemed strange, part of me sympathized: it was all they had left of their home. Just because they knew it was lost didn’t mean they knew how to let it go.

After three hours of rowing like galley slaves, distance had shrunk the island to the size of an open hand. It looked nothing like the foreboding, cliff-ringed fortress I had first laid eyes upon a few weeks ago; now it seemed fragile, a shard of rock in danger of being washed away by the waves.

“Look!” Enoch shouted, standing up in the boat next to ours. “It’s disappearing!” A spectral fog enshrouded the island, blanking it from view, and we broke from rowing to watch it fade.

“Say goodbye to our island,” Emma said, standing and removing her big hat. “We may never see it again.”

“Farewell, island,” said Hugh. “You were so good to us.”

Horace set his oar down and waved. “Goodbye, house. I shall miss all your rooms and gardens, but most of all I shall miss my bed.”

“So long, loop,” Olive sniffled. “Thank you for keeping us safe all these years.”

“Good years,” said Bronwyn. “The best I’ve known.”

I, too, said a silent goodbye, to a place that had changed me forever—and the place that, more than any graveyard, would forever contain the memory, and the mystery, of my grandfather. They were linked inextricably, he and that island, and I wondered, now that both were gone, if I would ever really understand what had happened to me: what I had become; was becoming. I had come to the island to solve my grandfather’s mystery, and in doing so I had discovered my own. Watching Cairnholm disappear felt like watching the only remaining key to that mystery sink beneath the dark waves.

And then the island was simply gone, swallowed up by a mountain of fog.

As if it had never existed.

*   *   *

Before long the fog caught up to us. By increments we were blinded, the mainland dimming and the sun fading to a pale white bloom, and we turned circles in the eddying tide until we’d lost all sense of direction. Finally we stopped and put our oars down and waited in the doldrummy quiet, hoping it would pass; there was no use going any farther until it did.

“I don’t like this,” Bronwyn said. “If we wait too long it’ll be night, and we’ll have worse things to reckon with than bad weather.”

Then, as if the weather had heard Bronwyn and decided to put us in our place, it turned really bad. A strong wind blew up, and within moments our world was transformed. The sea around us whipped into white-capped waves that slapped at our hulls and broke into our boats, sloshing cold water around our feet. Next came rain, hard as little bullets on our skin. Soon we were being tossed around like rubber toys in a bathtub.

“Turn into the waves!” Bronwyn shouted, slicing at the water with her oars. “If they broadside us we’ll flip for sure!” But most of us were too spent to row in calm water, let alone a boiling sea, and the rest were too scared even to reach for the oars, so instead we grabbed for the gunwales and held on for dear life.

A wall of water plowed straight toward us. We climbed the massive wave, our boats turning nearly vertical beneath us. Emma clung to me and I clung to the oarlock; behind us Hugh held on to the seat with his arms. We crested the wave like a roller coaster, my stomach dropping into my legs, and as we raced down the far side, everything in our boat that wasn’t nailed down—Emma’s map, Hugh’s bag, the red roller suitcase I’d lugged with me since Florida—went flying out over our heads and into the water.