Four years have passed since the Outbreak when they plagued London with their deadly menace.  For four years they have lain low, adapting to the open woodlands, now hideously mutated, they are led by a deformed monster and their craving has become uncontrollable. A farm cat is found mangled, a family of stoats slaughtered and nothing remains of a courting couple save shreds of clothing and a few gnawed bones…the rats have returned…