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.
Have you watched Season 4? Do you prefer Eliza with the Duke or Alexander Blake? Let us know in the comments below.
The season ends with Eliza standing on the roof of her agency, looking out over a smoky London. Blake is downstairs waiting to take her to a new case. Ivy is baking a cake in the kitchen. The Duke’s desk is gone. Miss Scarlet and the Duke - Season 4
For those willing to let go of the past, Season 4 offers the sharpest writing, the highest stakes, and the most authentic portrayal of a single, working woman in the 19th century since Victoria . Stream it on PBS Masterpiece or Amazon Prime Video. Just bring tissues—not for the mystery, but for the goodbye.
Here is everything you need to know about the explosive fourth season, from major cast departures and new love interests to the evolution of Eliza Scarlet as a solo detective in a man’s world. Before diving into plot details, the unavoidable headline of Miss Scarlet and the Duke - Season 4 is the reduced role of Stuart Martin, who plays the titular Duke. Following the conclusion of Season 3, Martin stepped back from the series to pursue other projects, namely the historical epic Rebel Moon . This moment defines Season 4
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.
The chemistry between Phillips and Durant-Pritchard is electric but entirely different from her dynamic with Martin. Where the Duke represented safety and frustration, Blake represents temptation and danger. He challenges Eliza’s rigid morality, asking her, "If you catch the killer but ruin an innocent man’s life to do it, are you still a good detective?" By the finale, she kisses Blake—not with passion,
However, arrived with a seismic shift that left audiences reeling. Gone is the familiar title card featuring the two leads staring longingly at each other. In its place is a leaner, meaner, and surprisingly bold narrative that proves this show is willing to sacrifice romance for realism.