She was quietly sleeping through the flight. Then the captain asked one unexpected question. Suddenly, seat 8A became very important.

Mara was already unfastening her seat belt.

The metal buckle struck the armrest with a sharp click that seemed impossibly loud.

She rose into the aisle.

For half a second, she couldn’t move.

Not because she was afraid of the aircraft.

Because twenty-three rows ahead, beyond the closed cockpit door, waited a version of herself she had spent eighteen months trying to bury.

Then the aircraft trembled.

Not turbulence.

A vibration.

High frequency. Faint. Rhythmic.

Mara’s eyes lifted toward the ceiling as if she could see through the fuselage.

“How long has it been doing that?”

The flight attendant stared at her. “Doing what?”

“That vibration.”

Another pulse traveled through the floor beneath Mara’s shoes.

The attendant swallowed. “Maybe ten minutes.”

Mara started walking.

“Tell me everything you know.”

The attendant hurried beside her. “Captain Mercer said they had conflicting flight-control indications. Then the first officer became ill.”