A mismatched group of people realises they must band together when a deadly virus begins to sweep the world.

The survivors are shocked at how quickly people resort to selfishness and violence.

Abby comes across a community run by the last surviving member of the government, which could hold the key to everyone's future.

Abby sets off in search of her son when she learns that a group of young boys are living in a nearby mansion.

A visionary spiritual leader turns up at the door with a ragtag group of disciples, provoking suspicion within the group.

The post-apocalyptic drama series concludes with Abby and her friends on the run from Samantha, who has formed a dangerous alliance that threatens everyone's freedom; Sarah is confronted by a face from the past, which leads her to betray her friends.