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The Thomas family arrive on Saint X for what seems like an idyllic family trip. Meanwhile, in present day Brooklyn, Emily has a surprise encounter with someone from her past. We see the genesis of Gogo and Edwin's friendship.

We learn more about what happened the night of Alison's disappearance. Alison is drawn to both Edwin and Tyler. Emily starts to dig deeper into her past. On an off-resort excursion, a tourist family stumbles across something shocking.

After the discovery of Alison's body, Gogo and Edwin become the presumed suspects. Emily continues to follow Clive, lying to Josh and Sunita.

We learn more about Clive's history, after he left the island. Clive reluctantly begins to open up to Emily, as she continues to pursue him, much more aggressively, with Sunita's help. Alison and Edwin get closer.

Someone from his past reaches out to Clive. Tyler tries to push things with Alison. Emily and Josh’s relationship is challenged as she continues to search for answers. Emily and Sunita clash over her growing obsession.

Emily can't stop thinking about the letter. The Thomas family visits Emily and Josh. We learn about Claire's past.

Emily promises Josh she will seek help. We learn about Young Edwin's secret. Alison tries to figure out the most exciting way to spend her last night of vacation.

Emily learns the truth from Clive. All is revealed about what actually happened that fateful night on Faraway Cay.