If you are in the United States, is available to stream on PBS Passport (the member-supported streaming service) and the Masterpiece channel on Amazon Prime Video. It also airs Sunday nights on local PBS stations.
After three seasons of near-misses and unspoken feelings, Season 4 forces Eliza and William to confront their connection. The arrival of new characters and the pressure of the Duke’s career trajectory act as the catalyst for long-overdue honesty. The Underworld of London: Miss Scarlet and the Duke - Season 4
As the season premieres, Emily and the Duke are still reeling from the aftermath of their whirlwind romance in Italy. With the Duke's proposal still fresh in their minds, they must confront the reality of their social differences and the scrutiny that comes with their love. If you are in the United States, is
The season posits that professional autonomy requires emotional sacrifice. Eliza’s rejection of Nash’s romantic advances and her refusal to relocate to New York for William demonstrate a mature prioritization of her business (Scarlet & Co.) over personal fulfillment. This is a notable evolution from earlier seasons, where her detective work often seemed a substitute for romantic connection. The arrival of new characters and the pressure
Critics are calling their chemistry "electrifying but refined." While Duke was fire, Blake is water. This juxtaposition creates a love triangle that doesn't feel forced. Eliza seems genuinely torn: loyalty to her past with William versus the comfort and respect of a new future with Blake.
Meanwhile, Detective Inspector William "The Duke" Wellington (Stuart Martin) finds himself at a crossroads. Having seemingly settled into domesticity with Arabella, the facade of his "perfect" life begins to show cracks. As the season progresses, William is forced to confront the one truth he has spent years running from: his feelings for Eliza.