Teens in the first generation to grow up in the apocalypse go on a cross-country journey.

An unexpected message upends Iris and Hope's worldview.

The group adjusts to outside life. Felix confronts his past.

Danger surrounds the group. Silas faces his past.

The group bonds and faces threats in a high school.

The group must band together to cross the Mississippi.

A newcomer has information that could help the journey.

As the quest continues, newcomers rouse emotions.

A brutal event prompts painful memories.

Hazards slow the group. Revelations change everything.

The group risks everything to learn the truth.