Ben and Michaela investigate a shocking murder in fear that it's connected to Flight 828. Meanwhile, Ben struggles to accept the life Grace led in his absence, while Olive and Cal realize that being twins after five and a half years apart is harder than they thought.

Stories unfold for those left behind in the aftermath of Flight 828's disappearance. Meanwhile in the present, Cal takes Ben on a mysterious adventure that awakens Ben to his son's perplexing abilities. Michaela tries to protect Jared from consequences at work, while keeping her romantic feelings at bay.