This novel was written in 1825. At the time Mayhew was a journalist and writer very much interested in social reform. Jack Black is a a rat catcher who claims to work for Queen Victoria. He draws crowds to his wares by showing how he can kill live rats with his poison pills.
Henry Mayhew (1812-1887) was an English social researcher, journalist, playwright and advocate of reform. He was one of the co-founders of the satirical and humorous magazine Punch in 1841. He is also known for his work as a social researcher, publishing an extensive series of newspaper articles in the Morning Chronicle that was later compiled into the book series London Labour and the London Poor (1851), a groundbreaking and influential survey of the city's poor.