The castaways are still reeling after a tragic event. Frustrated by everyone else's inaction, Rachel leads an expedition to the island's summit to get a lay of the land. We learn more about her career as an elite athlete, the extreme measures she's taken to succeed, and the brutal truth that she isn't sharing with the others.

Leah, Rachel, and Nora swim out to the plane wreckage and return with a crucial find. Fellow Texans Dot and Shelby search for a cave that might provide better shelter, but their contentious relationship makes matters difficult. Flashbacks reveal heart-wrenching secrets about Dot's home life.

On the island, Leah feels closer than ever to proving that someone's behind their predicament. Post-rescue, fed up with the tight-lipped authorities, Leah goes searching for her own answers.