The aftermath of a mystery virus sees the few remaining children of the world on their own. With no adults to guide, rule or protect them, the children are faced with the task of building a New World in their own image.

The core of the group, soon to be known as the Tribe, is formed with Amber at the fore. But what do they do about the prisoners Lex, Zandra and Ryan? And what surprise does Bray have for the group?

The tribe cannot decide on whether to let Bray and heavily pregnant Trudy stay in the mall. The tribe choose to vote on the matter and the deciding vote lies with Amber. Will she follow her heart or her head?

Trudy really is having the baby so the group work together to gather supplies, without the help of a distrustful Lex. Bray slips away at the end of the long day. Could he really have left the tribe literally holding the baby?

Trudy cannot feed the baby and is falling seriously ill. Dal believes antibiotics will help and sets out on a dangerous mission to his father's surgery. Lex bullies Jack into giving him and Ryan double the water ration.

Trudy is delirious with fever and her life hangs in the balance. Her only hope is Dal and the antibiotics... but will they be enough?