The rats, who previously lived unnoticed in holes, became bolder and bolder; once they tasted human meat, they realized that people are rather weak game. Moreover, changes occurred in the behavior of the rats - the larger black individuals seemed to lead their smaller brothers. After several cases of fatal rat attacks on people in London, a state of emergency was declared. Ordinary school teacher Harris will have to find out the reasons for the change in the behavior of rats and get to the origins of this whole story.