Mika has a new, near-indestructible body-a side effect of the Purge virus. Yet he broods in obscurity, pushing away everyone, including Amy, the one person who can lift his spirits. But when the Purge starts killing again, twenty years after it vanished, he accepts an open-ended mission and disappears. Thrust into power amid chaos, Amy struggles to rebuild a world ripped apart by the tension between those who carry the Purge and those who don't. When a general exploits that rift to grab power, Amy makes a bold decision that antagonizes the leaders of two states. As victims with Purge symptoms multiply, Mika returns with frightening news about the virus' variants and origins. With time running out, Amy must unite the bickering factions to stop the new outbreak from destroying their fragile society. But can she trust Mika again?