LEX is in despair with no antidote and no formula for the making of it either, he's done for! TAI-SAN tells the sceptical Tribe that she can find the answer: the best medicines come from plants. No one's buying it. A familiar face at a familiar farm: the return of rough, tough, LEX-baiting ALICE to the story and the introduction of her little sister ELLIE. But ELLIE has been infected with the virus! LEX is getting worse. Why did the antidote not work the first time? BRAY slips JACK the secret sample of antidote to analyse. Should they not give this last dose to LEX? But if it isn't analysed, LEX isn't the only one who will die. TAI-SAN, despite the others' doubts, goes to the woods to begin collecting the plants she needs. BRAY and JACK go back to the antidote lab to pick up equipment and are pounced on by a crowd of sick kids, desperate for the antidote. BRAY and JACK are pursued by the rabble back to the Mall and only just bring the grille down in time before the siege begins