Charlie Phelps, the new Detective Inspector at the City of London Police, hires Eliza for a case involving his uncle, Dylan Cooper. However, it turns out that Scotland Yard is also after Cooper, leaving Eliza caught in the middle.

Miss Scarlet (formerly titled Miss Scarlet and The Duke) follows Eliza Scarlet, Victorian London’s first-ever female detective.

In Season 6, a new Detective Inspector had taken charge at Scotland Yard; one with no intention of enlisting her services. But true to form, Eliza didn’t back down. Through grit and brilliance, she earned the DI's respect. And Eliza's maternal housekeeper decided to marry coroner Barnabus Potts as Season 5 wrapped—what will that mean for the household?Now as a new chapter begins, will Eliza continue to pour everything into the job, or will she attend to her personal life?