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.

With the detained passengers secretly moved and subjected to painful experimentation - and Cal's health directly linked to them - Ben takes advantage of an old friend to find out where the passengers were taken. Meanwhile, a mysterious new version of the calling pulls Michaela into a murder investigation that has deep personal ramifications for her.