A terrible epidemic, turning people into zombies, contaminated the city in a few days.
Panic didn't allow to quickly locate the site of infection and it's now the whole planet which is threatened by contagion.
Your previous exploits and your shooting skills have made you a key pillar of the fight against zombies and you have participated in the establishment of a refugee camp, composed of both civilian and military survivors.
Many missions await you, do not give up and have faith in yourself...
See also:
Decision 2
Decision Medieval