The fallout from the nuclear blast in Denver will hit Jericho in an hour and Jake has to get the residents inside. The official shelter is not adequate and Jake must find another shelter to protect them. Emily faces troubles of her own while being picked up by who she thinks are two officers.

Jake finds a stranger who is sick with radiation poisoning and he must make a decision whether or not to help him. The hospital's generator is running out of gas and the residents find that their supplies are also running low.