Daniel hated paying for parking. It was the one detail I never questioned, because it was so perfectly him.

So when he packed for the regional sales summit in Chicago, he told me he'd leave the Subaru in the airport's economy lot, the cheap one out past the rental returns where the shuttle took twenty minutes. "Forty bucks for the week instead of two hundred," he said, kissing my forehead in the dark of our kitchen. "See? I'm a catch." I laughed. He wheeled his suitcase to the waiting rideshare, and the front door clicked shut, and I went back to sleep thinking nothing at all.

He called every night that week. Background noise of a hotel bar, the clink of glasses, a colleague's name dropped here and there. He sounded tired in the right way. When he came home he smelled like airports and complained about the layover in Detroit. I believed every word, because why would I count the ways a person could be lying when they'd given me no reason to start?

The reason came in March, quietly, the way these things do. I was reconciling our accounts for taxes, the boring annual ritual I always handled because Daniel "didn't have a head for it." I'd pulled up the toll account to dispute a duplicate charge, and the ledger loaded in a long gray column of timestamps. Bridges, tunnels, the highway gantries we passed a hundred times a month. I almost closed it.

Then one line stopped my finger on the trackpad.

October 14. 3:14 AM. The Harriman Bridge, an hour north of us. Our transponder. Our car.

October 14 was a Tuesday. October 14 was the third night of Chicago. October 14 was a night his car was supposedly cold and empty in a lot three states away, while he slept in a hotel I could probably still find the confirmation email for.

I sat very still. I told myself there was an explanation, the way you tell yourself the floor is solid right before it isn't. The transponder doesn't fly. It doesn't lie. It doesn't get a layover in Detroit. It simply records, indifferent and exact, every time the car it's stuck to rolls under a gantry, and it had recorded my husband driving north at three in the morning toward a town where we knew no one.

Except, I learned, he did know someone. A woman with an apartment up there, and a key he kept on a ring I'd handed him myself. He'd never flown anywhere. He'd checked his bags into nothing. He'd spent the week an hour up the highway, forgetting that the road keeps better records than any spouse ever could.

When I showed him the screen, he didn't argue the bridge. You can't argue with a timestamp. He argued everything around it, all the soft human things—we'd drifted, he was lonely, it meant nothing. But the machine had already told me the only true thing in the room.

He always did hate paying tolls. In the end, he paid the biggest one of all.