The blue plastic cap from the dry-erase marker always smelled like stale vinegar whenever I pulled it off during third-period grammar. I remember that small detail because I was clicking it back into place when I marked Elena absent for the fourth time that month. She was nine years old and sat in the second row by the radiator that always knocked like someone hitting an iron pipe with a hammer. Her hair was braided tight by somebody who didn’t care much about symmetry, and she kept her pencils lined up on the wood grain with military precision.

Her mother always sent notes on scraps of lined notebook paper torn out of a spiral binder. The handwriting was neat enough, loop-loop script done with a ballpoint pen that skipped on the vowels. Family trouble, it said. That was the phrase used for everything in our county back then, from a drunk uncle sleeping on the front porch to the water well going dry in August. The principal, Mr. Grote, had told us flat out at the start of in-service week to mind our own lane with certain households.

Don’t make trouble for that family, he told me in the hallway while tapping a manila folder against his thigh. They got their own way of handling things.

So I signed the attendance register in red ink and moved on to the spelling lists. I told myself that kids miss school on farms and in the hollows all the time because of chores or seasonal sickness.

But I watched Elena more than I wanted to admit to myself. I watched the way her shoulders stayed locked up toward her ears whenever the heavy fire door at the back of the classroom banged shut in the wind. I noticed she flinched when Arthur Vance, her mother’s boyfriend who worked the timber trucks down by the river, walked across the asphalt during recess to drop off a lunch pail she didn’t even open.

I needed proof before I could say anything to anyone, or at least that is what I told my reflection in the bathroom mirror every evening while I scrubbed chalk dust off my thumbs. You cannot just go accusing people in a town where everybody’s grandfather fished in the same creeks. If you make a false step, the school board hears about it before the bell rings on Tuesday.

My hands stayed busy grading workbooks while the girl waited after school on those afternoons when nobody came to pick her up.

She would sit at the oak desk near the chalkboard with her hands folded flat between her knees, staring at the floor tiles until the janitor started running the buffer down the hall. Then she stopped coming. Not all at once, but the empty desk just stayed empty until Mr. Grote crossed her name off my roster with a black felt marker and wrote transferred across the margin.

Seven years passed in a blur of blue ink and parent-teacher nights that smelled like stale coffee and floor wax. I grew older in the same classroom while the world outside the tall sash windows kept paving over the dirt roads and putting up chain-link fences. I stopped looking for braids in the second row and started looking toward retirement, counting down the months until I could turn my keys over to someone younger and less tired.

At the Piggly Wiggly on a Tuesday afternoon, the air conditioning units were humming so loud they rattled the metal shelving holding the canned peaches.

I was standing by the produce bins checking the skins on the russet potatoes when someone stopped right beside my cart. A young woman was holding a heavy canvas grocery bag in one arm and balancing a chubby baby with a shock of red hair on her hip.

She had a faded blue denim jacket on and a pale, jagged scar running from the outer corner of her left eye down toward her jawline. I would have kept moving my hand through the potatoes if she hadn’t reached out and touched my forearm with her free hand. Her fingers were cold even though the store was humid enough to fog my glasses.

You were my teacher, she said.

The voice was thin and dry, but the cadence of it pulled me backward across seven years of chalk dust and rattling radiators in three seconds flat. I looked down at the baby, then up at her face, and my brain kind of stopped working for a second because the girl from the second row had grown into a stranger who looked like she had fought a war in her own kitchen.

Elena, I said. My voice came out too loud against the canned goods aisle, and an old man pushing a salt lick on a flatbed cart looked over his shoulder at us.

She didn’t smile. Her mouth stayed in that flat, hard line I remembered from the afternoons when she sat by the chalkboard waiting for a ride that never came on time. She touched the scar beneath her eye with two fingers, right where the skin puckered white against her cheekbone.

Why did you, she started, and then she stopped because her breath caught in her throat like she was swallowing gravel.

I didn’t move my hand off the cart handle. The metal was cold and slick with condensation from the freezer cases behind us. I wanted to tell her about the attendance register and the red ink and the way Mr. Grote had tapped that manila folder against his leg in the hallway. I wanted to explain that I was just a teacher trying to keep my head down until June so I could keep paying the light bill on my mother’s old house.

She didn’t let me talk. She just shifted the baby higher on her hip and looked right through me with eyes that had seen too much gravel road before she was even old enough to drive on one.

You had red pens, she whispered, and the way she said it made me feel smaller than I had ever felt standing in front of thirty kids who trusted me to keep them safe between eight and three. You had a whole desk full of them, and you just used them to mark me gone.

The baby started crying then, a sharp, ragged sound that cut through the hum of the dairy coolers. Elena turned her cart around without another word and pushed down the aisle toward the register without looking back to see if I was following her or if I was just standing there among the potatoes.

I watched her blue denim jacket disappear past the end-cap displays of laundry detergent. My hands were shaking slightly as I reached down and picked up a single russet potato, turning it over in my palm to check for bruises that weren’t there. The store was quiet in that weird way grocery stores get right before the evening shift changes, and nobody came down the aisle to ask me if I needed help finding anything.