Gabrielle's day was already bad enough. Her day-off has been cancelled, the city is under siege by a serial killer and the authorities are unable to catch the culprit. However, an earthquake strikes the city and a horde of monsters appears in large numbers. With the defenders outnumbered, the monsters overtake the city, turning it into a living hell.
Now, Gabrielle must partner up with the mysterious Vincent and other survivors to discover the cause of the city's downfall and survive long enough to bring help.