The book "Penny Sit-up" by Betascript Publishing provides an insight into the social conditions of the Victorian era, particularly regarding the first homeless shelters in London. It highlights the history of the Penny Sit-up, a facility operated by the Salvation Army to support needy individuals in the Blackfriars area. This shelter was notable as it offered clients the opportunity to sit in a warm room for a fee of one penny, but not to sleep. The book is based on articles from Wikipedia and other free sources, conveying an understanding of the social challenges and solutions of that time.