Lair is a novel written by James Herbert. It was first published in 1979 and is the sequeal to the novel The Rats.
Description[]
The mutant white rat had grown and mated, creating offspring in its own image. They dominated the others, the dark-furred ones, who foraged for food and brought it back to the lair. Now the dark rats were restless, and the white slug-like thing that ruled them remembered the taste of human flesh.