William Harrison Ainsworth's 'Old St Paul's' is a historical novel set during the Great Plague of London in 1665. Ainsworth's descriptive and immersive writing style brings the chaotic and terrifying atmosphere of the plague-ridden city to life, making the reader feel like they are right there in the streets of London. The novel is filled with vivid imagery and detailed historical references, making it a valuable piece of literature for those interested in historical fiction and the events surrounding the Great Plague. Ainsworth's intricate plot weaves together the personal stories of various characters, from the nobility to the common folk, giving a comprehensive view of how the plague affected all levels of society. 'Old St Paul's' is a gripping and informative read that transports readers back in time to a tumultuous period in London's history.