What if everyone you knew was an imposter?
Charlie knows there's an invasion. He knows it; even if the psychiatrists and his husband don't believe it.
They're replacing people, living their lives. He doesn't know how. He doesn't know why.
But now, they're after him.
Isolated on a flight, Charlie sees a flash of lightning strike the plane. But only Charlie sees the creature enter the plane.
It's inside the passengers. Jumping between them.
Unable to trust the passengers-or himself-Charlie races to reveal the creature and save the passengers because they're all replaced. Or worse.
With nobody on board believing him, and his own mind crumbling from within, how much will Charlie sacrifice to save everyone?
But what if the doctors are right? What if it's all in his head?