A family struggles to reunite in an American landscape void of electricity: a world of empty cities, local militias and heroic freedom fighters, where every single piece of technology -- computers, planes, cars, phones, even lights -- has mysteriously blacked out forever.

In order to rescue Danny, Miles knows he and the gang will need help. Thus, the search begins for Nora, a rebel fighter battling against the Militia. Meanwhile, Aaron confides in Maggie and Danny lays witness to what Captain Neville is capable of.

When Charlie meets a boy who's suffered a plight similar to her own, she relates and longs to help him and his young friends. First, she must convince Miles. Meanwhile, Rachel grows weary of General Monroe as she meets someone from her past.

When Nora encounters a close relative, she must make a difficult choice between family and a promise. Meanwhile, one of the most ruthless members of the Militia is tracking Miles, Charlie and the gang and General Monroe hands Captain Neville a stern warning.

Miles leads the rebel squad out of Philadelphia and away from Monroe’s helicopters and machine guns. Meanwhile, a guilt-ridden Rachel tries to redeem herself by providing power to the rebels, but once again must leave her children, Charlie and Danny, behind. As if there wasn’t enough heat, romantic sparks ignite between Miles and Nora.

Miles and Tom Neville find themselves fighting for the same cause but Miles still doesn’t trust him. Charlie, Jason and Nora attempt to pull off a daring river rescue of Dr. Stephen Camp to keep deadly anthrax out of the hands of Monroe. Meanwhile Rachel and Aaron are captured and threatened by Militia forces.

Rachel and Monroe battle with more than wits. Meanwhile, Miles, Charlie, Nora and Aaron get inside the Tower but Tom Neville and son Jason get shut out. Miles and Monroe once again face-off, this time even more lethally.

Life-threatening dangers abound on all sides as the Rebels infiltrate the Tower. Miles' leadership abilities and character are sorely tested as well as his feelings for Rachel and Nora. Aaron's genius comes in handy while Tom Neville and Randall Flynn bring new meaning to the dark side.

When Miles leads Monroe and Rachel south of the border; they're met with much more than they bargained for as Neville and Julia dance a delicate dance. Meanwhile, Charlie and Gene continue their search for Aaron.

Monroe finds himself in unfamiliar territory and must make a choice about his son Conner, while Neville and Julia continue to tango at Jason's dismay. Meanwhile, Gene leads Charlie to an uneasy discovery.