This isn't random. These are symptoms of the same underlying failure.
She looked at the man in the middle seat. He was back in his seat now: bag between his feet again, left hand on the armrest. His fingers had stopped tapping. She thought about that: the anxiety before the trip to the back, the calm after it. Something had changed for him when he went back there.
She put her pen down and looked out at the left wing for a long moment. As she wrote the last line in her notebook for this flight, underlining it once:
This isn't an accident. Something's failing or being forced to fail.
She closed the notebook, held it in both hands, and looked toward the front of the plane, where the cockpit door was closed and locked, and thought about what came next.
The first alarm didn't build up to anything; it just arrived.
One second the cabin was ordinary: Mr. Callaway typing on his laptop, the woman in 14C watching something on her tablet, a baby three rows back making the soft exploratory sound babies make when they're not yet unhappy but getting there.
The next second, a sharp repeating tone cut through all of it from somewhere forward, and the aircraft shuddered in a way that had nothing to do with turbulence. It was a full-body shudder, the kind that came from something changing in the powerplant, not from air moving the wrong way outside the fuselage.
Zariah felt it through the seat frame, through the armrests, through the soles of her shoes on the cabin floor. She'd felt it once before in her simulator—a dual-system fault scenario her father had programmed himself, labeled in his handwriting on a sticky note on the monitor: "What happens when two things fail at the same time?"
She was already sitting forward in her seat when the oxygen masks dropped.
They came down in a single synchronized motion from every overhead panel at once: the yellow cups swinging on their plastic tubes, the small bags not yet inflating, waiting for the passenger to pull the tube before they'd fill. The cabin filled immediately with a particular kind of sound that has no good name: not screaming, not yet, but the collective sharp intake of breath from 140 people who understood simultaneously that something was very wrong.
Danielle grabbed Zariah's arm.
"Put yours on," Zariah said. Her voice was steady. She reached up and pulled her own mask down, pulled the tube once to inflate the bag, and pressed it to her face. "Pull the tube. Like this."
Danielle's hands were shaking, but she did it.
The plane had nosed forward—not sharply, not the steep dive of a plane that had lost all control, but a definite, sustained downward attitude, the kind that pressed you into your seat at a slightly wrong angle. The kind that said the aircraft was descending faster than it was supposed to, and no one had told it to stop.