The Yard by Alex Grecian

Set in London right after the reign of Jack the Ripper, this novel has Walter Day— newly hired on at Scotland Yard—trying to solve the murder of a fellow detective. Afraid that they face a new Ripper and still suffering from low public opinion, the whole squad struggles with the possibility of a new type of criminal—the serial killer. Rich with historic details and full of tantalizing action, this is a fascinating look at the very start of modern police investigation—and the start of modern crime.