When Cal is discovered missing from his bedroom, Grace and Ben launch a desperate search which takes them to the remote mountains of upstate New York. A tantalizing trail of breadcrumbs leads them to a startling, game-changing discovery. Meanwhile, Michaela confronts the deceptive Autumn, and the shadowy "Major" finally makes an appearance.
When Montego Air Flight 828 landed safely after a turbulent but routine flight, the crew and passengers were relieved. But in the span of those few hours, the world had aged five years - and their friends, families and colleagues, after mourning their loss, had given up hope and moved on. Now, faced with the impossible, they're all given a second chance. But as their new realities become clear, a deeper mystery unfolds and some of the returned passengers soon realize they may be meant for something greater than they ever thought possible.