A mysterious virus starts killing off adults in the small town of Pretty Lake; pregnant teen Wiley plans to give up her baby and leave town.

The survivors in Pretty Lake collect the dead and hope to have the quarantine lifted; Adam meets a man with a mysterious past; Wiley seeks hush money.

Pretty Lake experiences a major power outage cutting out even local communications. Ronnie continues to cause trouble as the vigilantes take up guns.

A teacher who turns 22 fears she may be the next victim of the virus; Chuck punishes a kid who wrecks a car; Melissa searches for Wiley and her baby.

Ellen interrogates Mark about remaining residents in Pretty Lake; Chuck's friend Felix collapses and needs to get out of the quarantine zone.

Adam thinks he may have found a way out of Pretty Lake: Chuck and the Creekers agree to a cease fire, but it will require Ronnie to make a sacrifice.