Iris welcomes an enigmatic ally to their community while Hope questions the visitor's motives. A message upends the sisters' worldview, forcing them to decide between the safety of their home and the dangers of the world beyond.

The group adjusts to the reality of life beyond the walls of their community; Iris tries to take over, despite Hope's reservations; Felix and Huck follow the teenagers, while Felix is forced to face unwanted memories.

Burdened by their pasts, members of the group adopt opposing strategies for dealing with a massive obstacle; pressure is put on the group to return home.

While the group works together to cross the Mississippi River, a plot to steer the teens back home hits a snag. A member of the group must overcome past trauma to save the others from an approaching threat.

When an unexpected newcomer reveals information that could help them reach their destination, the group cuts a deal; while some are intrigued by the new arrival, others are suspicious.

A horrific discovery finds the group at crossroads and prompts one of them to revisit past trauma.

A series of setbacks causes a member of the group to reevaluate their role in the mission. Someone makes a surprising discovery. A startling revelation casts everything in a new light.

A divided group struggles to reunite; others set their sights on the greater good.