Charon's Debt

The culprit behind the zombie outbreak has been revealed, but is it too late to stop it? The world is falling apart, the President of the United States has recalled the armed forces to make a last stand against the zombie hordes, and Monica receives a call from home, begging for help.
With Sean in control of the compounds, can they somehow find a way to regain control while still rescuing the loved ones surrounded by the zombie hordes?