I had only opened the email because I was looking for a Kohl’s coupon.

That is the embarrassing little truth of it. Not instinct. Not suspicion. A coupon for twenty percent off bath towels because our guest bathroom rug was looking flat after thirteen years.

Nolan and I shared an email address for household things. Electric bill. Costco renewals. Airline miles. He always handled the flights because he traveled three states over for plumbing supply sales, and I handled everything else that required remembering birthdays or buying furnace filters at the hardware store on Main Street.

The subject line said: Upgrade confirmed.

I clicked it while standing in my slippers beside the laundry basket in our utility room. The dryer was thumping because one of Nolan’s belt buckles had gotten loose in his jeans and kept hitting the inside drum like a small hammer.

Passenger 1: Nolan Mercer.

Passenger 2: Erica Voss.

First class, Little Rock to Phoenix.

Seats 2A and 2B.

I knew Erica. Of course I did. She was thirty-two and ran the regional office accounts down in Texarkana. She had sat across from me at the company Christmas dinner wearing a green velvet dress that cost more than my winter coat and asked if my pecan pie was from scratch or church-lady scratch.

I stared at the screen until the little blue letters stopped behaving.

Then I called Nolan.

He answered on the second ring, too cheerful for a Tuesday morning in an airport parking deck.

I asked who Erica was to him.

He sighed, like I had asked him where he put the rake after mowing the side lawn.

“Don’t make airport points emotional,” he said.

Not It’s a mistake. Not Let me explain. Not Susan, wait.

Airport points.

That is what my thirty-one years of marriage were worth to him. A line item on a corporate rewards statement.

He told me Erica’s upgrade was a work perk. He said the company booked it. He said if I showed up at the airport and embarrassed him in front of his regional director, I would regret it before the week was out.

So I got dressed.

I put on the navy cardigan my sister says makes me look like a librarian, mostly because I wanted pockets that buttoned down. I slipped our joint Capital One card into the right pocket and my driver’s license into the left. I printed the email on our sputtering old HP printer because I am fifty-eight years old and paper still feels like proof when words over the phone turn slippery.

The airport smelled like stale coffee, fresh floor wax, and that burnt pretzel smell from the kiosk near security gate B.

I did not have a ticket, so I went to the main airline counter first, bypassing the kiosks where younger people tapped their phones.

The young man behind the counter had a badge that said Tyler and acne he was trying to cover with powder. He said he could not discuss another passenger’s itinerary due to federal privacy rules.

I said I understood completely.

Then I slid my driver’s license and the Capital One card across the grey laminate counter.

“That card paid for both upgrades,” I said. My voice did not shake, which surprised me.

Tyler blinked at the card, then at my driver’s license, matching the last name Mercer. He tapped his keyboard three times, his fingers pausing over the enter key.

“Let me get my supervisor,” he whispered.

His supervisor came out from a frosted glass door behind the luggage scales. Her name tag said Dana, and she had silver hair cut into a sharp bob that stayed put even in the drafty terminal.

Dana looked at my printed email, then looked at me in a way that made my mouth go dry as dust.

“Mrs. Mercer,” she said carefully, keeping her voice low. “Can you wait right here by the side pillar for just a minute?”

Nolan texted at 10:47.

Stop this.

Then Erica texted me from a number I did not save in my phone.

Susan, please don’t make this ugly. He said you two had an arrangement.

An arrangement.

I had spent the night before hemming Nolan’s gray work pants because he always complained that the store-bought cuff dragged on his shoe heel. Erica had probably watched him pack them into his hard-shell roller bag while he told her how difficult I was to live with.

Dana returned with a long, folded boarding pass envelope made of heavy cardstock. She did not hand it to me right away. She held it in both hands like it was breakable or leaking.

Behind her, through the tinted glass of the departure lounge, I saw Nolan standing near Gate C18.

Then I saw Erica touch his sleeve, laughing at something he whispered into her hair.

Dana leaned closer across the counter and said, “There’s something else attached to this account, Mrs. Mercer. Something the automated system flagged when you ran that card.”

She opened the envelope, and the first name on the second printed itinerary was not Erica’s.

It was mine.

Or rather, it was a duplicate set of tickets for flights I had never taken, charged to the same corporate account over the last fourteen months, all booked out of Shreveport while Nolan told me he was inspecting warehouses in Memphis.

Dana laid a second piece of paper on the counter, still warm from the printer in the back room.

“My husband is a ramp manager for this airline down in Dallas,” Dana said, her voice dropping another octave. “He’s the one who looked up your card when Tyler flagged the duplicate charge. Erica’s husband is out of work right now, Mrs. Mercer. But she’s been flying with Nolan on his personal miles for eighteen months. And your husband used your household card to pay the baggage fees for her every single time.”

I looked at the dates on the printout.

April twelfth. August third. November nineteenth.

Every single one of those weekends, Nolan had kissed my forehead at the front door, told me to take care of the hydrangeas while he was gone, and driven two hours south to catch a flight with a woman who asked about my pie crust.

Nolan’s phone buzzed in my coat pocket where I had left my own cell phone resting on vibrate.

I didn’t answer it.

Dana slid the envelope across the counter until it touched my knuckles.

“Gate C18 is boarding group two right now,” she said softly. “My husband says you have every right to go down there and ask them about your baggage fees.”

I picked up the envelope, smoothed the stiff paper with my thumb, and started walking toward the metal detector.