Bureyton Hall - The Legacy Series Book 4

Eleanor Griffin-Biddles, former housemaid to the Earl of Bureyton in 1812, has married and started a business creating Regency-era costumes in the modern day. Eleanor's world is threatened when a nineteenth century murderer leaves a dead body behind her shop. Accustomed to solving murders in modern-day London, Detective Inspector David Massey runs into a rather unusual problem on his latest case: time travel.
When he learns that his wealth may also factor in the enquiry, Massey has a decision to make. Keep the secret, along with the one he's withholding from his girlfriend, Kate, or expose the source of his family's success.