On the surface, the city of Leighton is just like any other city: tall buildings, busy streets, and populated by a wide variety of people. It also has rats. These vermin are unlike the average pest, because they are carrying a deadly contagion. Havoc ensues as the devastating virus seeps into the unsuspecting populace, turning friends and family against each other. Atrocities of savage behavior are spreading faster than people can outrun, and the citizens get recklessly desperate. Whether by joining forces, or by standing alone, survival is on everyone’s mind. Unfortunately, not everyone will escape with their life.