The war for survival continues. The fight for Song Island is over. Despite suffering losses, Will and his group have claimed the island as their own and achieved the safe haven they’ve longed for since The Purge. Months later, Will makes contact with another group of survivors, and travels to their base in hopes of striking an alliance and gathering much-needed medical supplies. Instead, he finds himself in the middle of another bloody battle. With Will gone, Lara must take up a leadership position on the island, and is immediately confronted with a difficult choice. It’s a lot of pressure for a third-year medical student, especially when her decisions may cost lives. Meanwhile, the ghouls have launched yet another startling new phase of their master plan, forcing Will to venture deep behind enemy lines to collect valuable intelligence. What he discovers will change everything. Where The Purge begins, and the Gates hold, the Stones will crumble…