Journalist John Pender has returned to his home town of Whiteshead to rekindle his marriage. Ex-British Intelligence Officer Dave Johnson has arrived to isolate himself after his fiance is murdered during a mission that went terribly wrong. But excavations for the new shopping centre unearth a mysterious contagion that threatens to throw their lives into chaos. Now the residents of Whiteshead are trapped within a quarantine zone with the military on one side and ravenous hordes on the other. Escape is no longer an option.