Desperate to find his brother, Alex ventures onto the mainland to find the Survivor Board. Instead, he finds danger and becomes separated from Lucy and The Big Easy. Hunting for a place to hide from the roaming zombies, he discovers that the undead virus is mutating with horrific consequences. With only one chance to get a message to Lucy, Alex must fight for survival as he travels across a zombie-infested wasteland. And while he struggles to find his way back to Lucy, a terrible new threat arises.