Society breaks down after a virus causes the infected to turn into cannibalistic killers. When Evie's husband John becomes separated from the rest of the group during an attack, the survivors fall back to their emergency shelter. Gary and Evie want to wait for John, as they all agreed they would do in such a circumstance, but Bob becomes increasingly impatient. Citing the realities of the situation, Bob says they must assume John is dead and leave for a more permanent shelter. Although Bob backs down, he later takes the group's car, rifle, and supplies by force. When Gary objects, Bob shoots him in the head, killing him. Sammy, the group's mechanic, and Marge, Bob's wife, leave with him. They leave Evie behind.