Humanity lives with the "Returnees" normal looking people who have been infected by a devastating virus. Only the daily injection of a protein prevents them from becoming zombies. Kate works in a research unit urgently trying to find a definitive vaccine to prevent the epidemic from spreading. It also hides a powerful reason: his partner, Alex, is a "returned". Chaos breaks out when the Government announces a shortage of Protein and paralyzing investigations, forcing all infected to enter a high-security military center. Fearing the worst, Kate and Alex decide not to follow orders and flee. Your countdown has begun for survival.