Howie’s group disembark from the Isle of Wight, but when the ferry they take breaks down they climb aboard a Royal Navy supply vessel at anchor outside Portsmouth Harbour to find a huge horde of undead. We meet Maddox and a group of council estate children who have survived the apocalypse by taking refuge in a cannabis plantation.

When a horde of undead attack the children, Howie tries to save them only to find they turn on him. Eventually a truce is called, and an uneasy alliance begins to develop.