After finishing a long shift as a nurse, Ana returns to her suburban neighborhood and her husband, Luis. Caught up in a scheduled date night, they miss an emergency news bulletin. The next morning, a neighborhood girl enters their bedroom and kills Luis, who immediately reanimates as a zombie and attacks Ana. She flees in her car, crashes, and passes out. Upon waking, Ana joins police sergeant Kenneth Hall, electronics salesman Michael, petty criminal Andre and his pregnant wife, Luda. They break into a nearby mall and are attacked by a zombified security guard, who scratches Luda. Three living guards — C.J., Bart, and Terry — make them surrender their weapons in exchange for refuge. They split into groups to secure the mall. On the roof, they see another survivor, Andy, who is stranded in his gun store across the zombie-infested parking lot. The next day, a delivery truck carrying more survivors enters the lot, pursued by zombies. C.J. and Bart wish to turn them away but are overruled and disarmed. The newcomers include Norma, Steve Marcus, Tucker, Monica, Glen, Frank and his daughter, Nicole. Another woman is too ill to walk; she is wheeled inside via wheelbarrow, only to die and reanimate. After she is killed, the group determines the disease is passed by bites. Andre leaves to see Luda, who has kept her scratch hidden from the group. They realize that Frank has been bitten and is a potential threat. After some debate, Frank elects to be isolated. When he dies and turns, Kenneth shoots him.