Yesterday Arrived Without Any Children

How it begins

Lena Sen knew it was yesterday because the bakery had burned the same tray of rolls.

She knew something was wrong because the school crossing was empty.

At eight twenty, the corner usually filled with backpacks, scooter wheels, and adults negotiating departures as though affection could be measured in the number of times someone said hurry.

Today, the crossing light changed for nobody.

Lena checked her phone. Tuesday.

It had been Wednesday when she'd gone to bed.

A man ran out of the school gate carrying a ring of keys.

"You work at the transit laboratory," he said.

Hugh Ren. The caretaker. He had once helped her retrieve a demonstration clock from a roof after an experiment behaved more confidently than its funding application.

"What's happened?"

"That's what I was going to ask you."

Inside the school, coats hung on hooks. Half-finished drawings covered a table. A small chair lay on its side beside the reading corner.

No children.

No recorded departures. No calls from parents. When Hugh rang the first number on his list, a woman answered and asked what school he meant.

Lena looked at the laboratory access card in her hand.

The time-transit system was supposed to preserve a city through an emergency by holding one complete day outside the flow. She had signed off the stability tests. She had not signed off this morning.

On the classroom wall, a digital clock blinked.

For one second, its numbers became letters.

WE ARE NOT LOST.

Then the time returned.

Hugh stepped closer. "Did you see that?"

Lena nodded.

Outside, the crossing light changed again. Somewhere in the quiet building, a school bell rang exactly on schedule.

She had spent years making time behave reliably.

Now she needed to know what, precisely, the system had decided a complete day should contain.