Miss Scarlet And The Duke - Season 4 -

Trapped in a stalled carriage during a storm, Blake confesses that he isn't helping her for justice, but because he is "infatuated with her stubbornness." It’s a raw, whiskey-soaked confession that feels earned. However, unlike her moments with the Duke, Eliza does not blush. She analyzes. She asks, "Are you confessing love or leverage?"

To survive, Eliza takes a case involving a missing aristocrat’s daughter. This case forces her to team up with the one man she swore she never would: Alexander Blake (Tom Durant-Pritchard), a charismatic, roguish ex-convict turned informant. If the Duke is order, Alexander Blake is chaos. Introduced as a morally grey fixer with a silk scarf and a silver tongue, Blake is the most dangerous addition to Season 4. He isn't interested in rules; he is interested in results. Miss Scarlet and the Duke - Season 4

So, is the Duke gone for good? Not entirely. Martin appears in a limited capacity, acting as a narrative bridge. The season premiere cleverly writes Wellington out by having him accept a prestigious position at the New York Police Department. This transatlantic move leaves Eliza (Kate Phillips) utterly alone in London. Trapped in a stalled carriage during a storm,

This was a high-risk gamble for the writers. The "will-they-won't-they" tension was the emotional engine of the show. By removing the Duke, Season 4 forces a brutal question: Is Eliza Scarlet a detective because of the Duke, or in spite of him? The season opener wastes no time establishing the new status quo. We find Eliza drowning. Not literally, but financially and emotionally. Without the Duke’s unofficial protection, her male clients are evaporating. The police force, led by a new antagonist, Detective Inspector Fitzroy (played by a menacing Cal MacAninch), views her as a nuisance. She asks, "Are you confessing love or leverage

This moment defines Season 4. Eliza Scarlet is no longer a girl waiting to be chosen. She is a woman deciding who is worthy of her partnership. By the finale, she kisses Blake—not with passion, but with calculation. It is a kiss of acceptance, not surrender. The final episode brings the Duke back for one crucial scene. William Wellington returns to London to collect his remaining belongings. Seeing Eliza running the agency with Blake by her side, the Duke has a moment of quiet devastation. Stuart Martin plays this with heartbreaking subtlety—a single tear, a forced smile, and a goodbye that feels permanent.

In a twist no one saw coming, the Duke does not fight for Eliza. Instead, he thanks her. He admits that watching her struggle without him made him realize she never needed him—she only needed the confidence he gave her.