In reply, I released a rapid-fire triple sneeze. The air was swimming with dust. Emma blessed me and lit a flame in her hand, which she held up to the nearest crate. It was labeled Rm. AM-157.

“What do you think is in them?” I said.

“We’d need a crowbar to find out,” said Emma. “These are sturdy.”

“I thought you were clairvoyant.”

She made a face at me.

Lacking a crowbar, we ventured farther into the room, Emma enlarging her flame as we left the petering window light behind. The narrow path between the boxes led through an arched door and into another room, which was equally dark and nearly as cluttered. Instead of crates, it was crammed with bulky objects hidden beneath white dust covers. Emma was about to pull one away, but before she could I caught her arm.

“What’s wrong?” she said, annoyed.

“There might be something awful under there.”

“Yes, exactly,” she said, and tore away the cover, which scared up a cyclone of dust.

When the air cleared, we saw ourselves reflected dimly in a glass-topped case of the sort you find in museums, waist high and about four feet square. Inside, neatly arranged and labeled, were a carved coconut husk, a whale vertebra fashioned into a comb, a small stone axe, and a few other items, the usefulness of which wasn’t immediately obvious. A placard on the glass read Housewares Used by Peculiars on the Island of Espiritu Santo, New Hebrides, South Pacific Region, circa 1750.

“Huh,” Emma said.

“Weird,” I replied.

She replaced the dust cover, even though there was little use in covering our tracks—it wasn’t as if we could unbreak the window—and we moved slowly through the room, uncovering other objects at random. All were museum displays of one type or another. The contents bore little relation to one another save that they had once been owned or used by peculiars. One contained a selection of brightly colored silks worn by peculiars in the Far East, circa 1800. Another displayed what appeared at first glance to be a wide cross-section of tree trunk but upon closer inspection was in fact a door with iron hinges and a knob made from a tree knot. Its placard read Entrance to a Peculiar Home in the Great Hibernian Wilderness, circa 1530.

“Wow,” Emma said, leaning in for a closer look. “I never knew there were so many of us in the world.”

“Or used to be,” I said. “I wonder if they’re still out there.”

The last display we looked at was labeled Weaponry of the Hittite Peculiars, Kaymakli Underground City, no date. Bafflingly, all we could see inside were dead beetles and butterflies.

Emma swung her flame around to look at me. “I think we’ve established that Bentham’s a history buff. Ready to move on?”

We hurried through two more rooms filled with dust-covered display cases, then arrived at a utilitarian staircase, which we climbed to the next floor. The landing door opened onto a long and lushly carpeted hallway. It seemed to go on forever, its regularly spaced doors and repeating wallpaper creating a dizzying impression of endlessness.

We walked along peeking into rooms. They were furnished identically, laid out identically, wallpapered identically: each had a bed, a night table, and a wardrobe, just like the room I’d recuperated in. A pattern of red poppy vines curled across the wallpaper and continued through the carpeting in hypnotic waves, making the whole place seem like it was being slowly reclaimed by nature. In fact, the rooms would’ve been entirely indistinguishable had it not been for the small brass plaques nailed to the doors, which gave each a unique name. All were exotic sounding: The Alps Room, The Gobi Room, The Amazon Room.

Perhaps fifty rooms lined the hallway, and we were halfway down its length—hurrying now, certain there was nothing of use to be discovered here—when a blast of air rolled over us that was so cold it prickled my skin.

“Whoo!” I said, hugging myself. “Where’d that come from?”

“Could be someone left a window open?” Emma said.

“But it’s not cold outside,” I said, and she shrugged.

We continued down the hall, the air chilling more the farther we went. Finally, we turned a corner and came to a section of hall where icicles had formed on the ceiling and frost glistened on the carpet. The cold seemed to be emanating from one room in particular, and we stood before it watching flakes of snow waft, one by one, from the crack beneath its door.

“That is very strange,” I said, shivering.

“Definitely unusual,” Emma agreed, “even by my standards.”

I stepped forward, my feet crunching on the snowy carpet, to examine the plaque on the door. It read: The Siberia Room.

I looked at Emma. She looked at me.

“It’s probably just a hyperactive air conditioner,” she said.

“Let’s open it and find out,” I said. I reached for the knob and tried it, but it wouldn’t turn. “It’s locked.”

Emma put her hand on the knob and kept it there for several seconds. It began to drip water as ice melted from inside it.

“Not locked,” she said. “Frozen.”

She twisted the knob and pushed the door, but it opened only an inch; snow was piled up on the other side. We put our shoulders to its surface and, on the count of three, shoved. The door flung open and a gust of arctic air slapped us. Snow flurried everywhere, into our eyes, into the hall behind us.

Shielding our faces, we peered inside. It was furnished like the other rooms—bed, wardrobe, night table—but here were indistinct humps of white buried under deep-piled snow.

“What is this?” I said, shouting to be heard above the wind’s howl. “Another loop?”

“It can’t be!” Emma shouted back. “We’re already in one!”

Leaning into the wind, we stepped inside for a closer look. I’d thought that the snow and ice were coming through an open window, but then the flurry abated and I saw there was no window at all, not even a wall at the far end of the room. Ice-coated walls stood on either side of us, a ceiling above us, and probably a carpet was somewhere below our feet, but where a fourth wall should’ve been the room gave way to an ice cave, and beyond that to open air, open ground, and an endless vista of white snow and black rocks.

This was, as near as I could tell, Siberia.

A single track of shoveled snow led through the room and into the whiteness beyond. We shuffled down the path, out of the room and into the cave, marveling at everything around us. Giant spikes of ice rose from the floor and hung from the ceiling like a forest of white trees.

Emma was hard to impress—she was nearly a hundred years old and had seen a lifetime’s worth of peculiar things—but this place seemed to fill her with genuine wonder.

“This is astonishing!” she said, bending to scoop up a handful of snow. She tossed it at me, laughing. “Isn’t it astonishing?”

“It is,” I said through chattering teeth, “but what’s it doing here?”

We threaded between the giant icicles and emerged into the open. Looking back, I could no longer see the room at all; it was perfectly camouflaged inside the cave.

Emma hurried ahead, then turned back and said, “Over here!” in an urgent voice.

I shuffled through deepening snow to her side. The landscape was bizarre. Before us was a white, flat field, past which the ground fell away in deep, undulating folds, like crevasses.

“We’re not alone,” said Emma, and pointed to a detail I’d missed. A man was standing at the edge of a crevasse, peering down into it.

“What’s he doing?” I said, more or less rhetorically.

“Looking for something, it would seem.”

We watched him walk slowly along the crevasse, always staring down. After about a minute, I realized I was so cold that I could no longer feel my face. A gust of snowy wind blew up and blanked the scene.

When it died down a moment later, the man was staring right at us.