The Final Problem is scheduled to premiere on Netflix on September 25, 2026. The Spanish production is a four-episode period mystery and thriller limited series based on Arturo Pérez-Reverte's novel El problema final. In a September 22 check, the official title page was already live on Netflix, while the platform's release calendar still listed the series for September 25.
When does The Final Problem premiere and what is its format?
Netflix confirmed the September 25, 2026 premiere in its official announcements and also included the production in its September release calendar. The trailer announcement published on September 3 describes The Final Problem as a four-episode limited series combining thriller, mystery and a period setting.
| Item | Confirmed information |
|---|---|
| Premiere | September 25, 2026 |
| Platform | Netflix |
| Format | Limited series |
| Episodes | 4 |
| Genre | Mystery, thriller and period drama |
| Source material | El problema final by Arturo Pérez-Reverte |
| Director | Félix Viscarret |
The main official references are Netflix's trailer announcement, the official title page and the September release calendar on Tudum.
What is the premise, without spoilers?
The story takes place in the spring of 1959. Thirteen people are stranded by a storm on a small island near Mallorca, staying at a hotel that no one can leave and no one can reach. When Elisa Mander, an English tourist, is found dead, what initially looks like a suicide begins to raise the possibility of murder.
At the center of the investigation is Basil, played by Jose Coronado. He is a retired actor who was once known for playing Sherlock Holmes on the big screen. Faced with the death and the group's isolation, Basil ends up using the reasoning he learned while portraying the detective to try to understand what happened. The setup places guests and staff under suspicion without requiring the synopsis to reveal the solution to the case.
Who is in the cast?
Jose Coronado leads the cast as Basil. Netflix also highlights María Valverde as Adela Figueroa, a young woman traveling with a friend; Martiño Rivas as Foxá, an aspiring thriller writer; and Maribel Verdú as Mrs. Ausländer, the hotel manager.
The cast also includes Gonzalo de Castro, Cristina Kovani, José Condessa and Pepón Nieto. Netflix's official title page also lists Daniel Holguín and Michael Stobbe. In promotional materials, Gonzalo de Castro appears as Fonseca, an ambitious film director, while Cristina Kovani plays a young actress.
Which book is the limited series based on?
The series adapts El problema final, a novel by Arturo Pérez-Reverte published by Alfaguara in 2023. The book starts from a premise similar to the screen version: a group isolated by a storm, a suspicious death and a veteran actor associated with Sherlock Holmes who ends up taking on the role of investigator.
Some setting differences are already visible in the official synopses. The publisher's description of the book places the action in June 1960, with nine travelers on the fictional island of Utakos across from Corfu, and names the victim Edith Mander. Netflix's adaptation moves the story to the spring of 1959, gathers thirteen people on an island near Mallorca and names the victim Elisa Mander. These differences show that the series keeps the core mystery while adjusting setting and character details for television.
The Spanish edition of El problema final was published by Alfaguara in September 2023, according to the publisher's page.
Who is making the series?
The Final Problem is produced by Mod Producciones. Fernando Bovaira serves as producer, Urko Errazquin as executive producer and Félix Viscarret directs the limited series. The scripts are written by Alberto Macías, Carlos Molinero and Marisol Farré, according to Netflix.
What to check on Netflix on September 25
Because the premiere had not yet taken place at the time of the September 22 check, some practical details should be confirmed directly in the Netflix app or on the title page once the series is released. These include the actual availability time in Brazil, the runtime of each episode, audio and subtitle options and the maturity rating shown in the Brazilian catalog.
For now, the confirmed points are the September 25 date, the limited-series format, the four episodes and the adaptation of Pérez-Reverte's novel. For viewers deciding whether to watch, the project is framed as a period closed-circle mystery built around suspects gathered in one location and an investigation led by an actor carrying the memory of having played Sherlock Holmes.
