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.

After seeing a broadcast via satellite from Asia, Jake gathers a group of people together for information gathering. After finding out that there is information out there, Jake suggests having four search parties to go out to get a better understanding what is going on outside of Jericho. The search parties set off in four different directions.

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.

The children of Jericho start to return back to school. A power line that has fallen causes an accident on the playground when the power returns. Jake has an argument with his mother regarding a secret that Jake hasn't disclosed to his dad.

Hawkins must step in when an argument between Jake and an adversary becomes heated. After an electromagnetic pulse leaves Jericho in the dark crime runs rampant. Later, Jake is held at gunpoint and is rescued.

The slick gang leader Jonah bails Mitchell out of jail and agrees to give back the food that his bandits stole and agrees to keep out of Jericho. This plan strays off-course as Jonah negotiates new terms involving Jake and Emily.

Some of the residents of Jericho are concerned that Gray's actions may actually make Gray the new mayor. In other news, Mitchell claims that Jonah is the killer under much speculation.

Jake, his dad, Heather and Dale visit Black Jack to try and find the parts needed to fix the windmill. Sarah goes home with Hawkins against the rest of his family's wishes.

Roger gets desperate after Gray kicks the refugees out of Jericho. Dale and Skylar collect on some debts. Hawkins continues his quest to find Sarah's contacts.

Meanwhile, Hawkins begins the process of finding who's coming after him.

Jake believes something more is wrong after Eric doesn’t return from New Bern. Jake and Hawkins go to New Bern and discover that Jericho is in danger.

The hostility mounts between the citizens of Jericho and New Bern. A handful of residents of New Bern are shot and injured after getting caught trying to steal from the Jericho salt mine.

The residents of Jericho and New Bern fight over precious resources and Gray must make a tough decision after the streets of Jericho are bombed.

The battle with New Bern ensues, with Jericho residents out-manned and out-gunned, but not outsmarted. Jericho gains the upper hand but suffers a significant casualty. A friend of Jake's sends help from an unexpected source.

Hawkins receives a call on from someone who knows who he is, where he is and lets Hawkins know exactly when he'll be caught.

Meanwhile, tragedy strikes.