A close-knit family is enjoying a quiet Saturday morning in their familiar, peaceful suburb. As the sun shines outside, it seems as though this will be just another ordinary Saturday morning. But nothing could be further from the truth. Suddenly, a mysterious and aggressive virus spreads rapidly through the streets, turning the peaceful neighborhood into a chaotic and violent danger zone in no time. The virus transforms infected people almost instantly into unpredictable, life-threatening creatures. Forced to barricade themselves in their own homes to survive, fear strikes mercilessly when the threat reaches their front door as well. Relying entirely on themselves and each other, every decision they make will mean the difference between life and death.