Miss Scarlet And The Duke - Season 4

Victorian London, roughly 12 years after the events shown in the flashback episode "Origins". Central Arc: Eliza takes over leadership at Nash & Sons

This forces Eliza to rely on new allies—most notably Detective Inspector Fitzroy (Evan McCabe), a younger, awkward, by-the-book officer who becomes her grudging collaborator. Fitzroy is a refreshing contrast: he’s not a romantic rival but a professional foil. Their dynamic is less charged but more practical, and it allows Eliza to showcase her deductive skills without William swooping in to save her. Miss Scarlet and the Duke - Season 4

Concurrent scenes set in New York provide William with his own developmental trajectory. Removed from the familiar hierarchy of Scotland Yard, he confronts a more chaotic, violent, and corrupt police force. His arc interrogates the nature of traditional masculinity: William’s identity has been deeply tied to his uniform, his authority, and his protective role over Eliza. In New York, stripped of these markers, he experiences professional disillusionment. Victorian London, roughly 12 years after the events