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The fates of the Family, the Lab and the rest of the world come crashing together in a deadly showdown. The Family are in pursuit of Abby's son, Peter, who is in grave danger. The chase leads them to an airfield where the final confrontation takes place.
Abby learns of a group of young boys living at a nearby mansion called Waterhouse. She leaves her new friends in order to find her son, Peter. When she arrives at Waterhouse she walks into the middle of a land dispute between an ex-army officer and an aggressive group of teenage boys. She must try and broker a truce in order to discover if Peter is at the house. Tom, Sarah, Al and Najid are drawn to the comfort and security that Samantha's community provides. Things quickly go wrong for Al as he is ejected from the community. Tom sees the chance to prove himself to Samantha, but will his criminal past catch up with him? Greg and Anya have an encounter with some unwelcome visitors that provides a vivid reminder of how vulnerable they are without the group.
Abby stumbles across a community that could hold the key to everyone's future. The group is led by Samantha Willis - the last surviving member of the Government. She has set up a community that still boasts light, hot water, food and power, all drawn from sustainable sources. Abby and Samantha hit it off immediately and Abby is full of hope that Samantha might lead the remaining population to build a new and better society. Samantha sees that Abby could become a trusted ally, but Abby's illusions are shattered when she sees the lengths Samantha will go to in order to maintain control of her fledgling community.
With Abby still missing and Greg recovering from his injuries, the Family are left scavenging for survival in the city. While Naj leaves graffiti messages for Abby, Tom steals supplies from other survivors. The Family learn that more people have been abducted like Abby and that the kidnappers bear the markings of a known pharmaceutical company.