Michaela finds a welcome distraction in helping Jared with an investigation. Cal tests a new ability. Ben and Saanvi try to decode a mysterious message.
Michaela heads to a dock with Jared to look into Ben's Calling. Saanvi walks Cal through a daunting task. A dark presence infiltrates the Stone family.
As terrifying plagues descend on the detention center, Saanvi scrambles for a solution and Michaela steps up in a crisis. Cal attempts to reach Angelina.
Michaela and Jared make the most of their arrangement. Angelina receives support from Eagan. Panic grips the detainees amid devastation at the facility.
As the Death Date nears, Callings begin to take a toll on Cal. The group sends out a cry for help. A familiar face provides hope in an unexpected place.
All signs point to the end of the Earth, spurring the Stone family and the passengers to work together and decipher cryptic clues before time runs out.