The Final Problem Netflix Cast, Characters and Arturo Pérez-Reverte Book Explained

The Final Problem is a four-episode Spanish Netflix mystery series arriving on September 25, 2026. Based on Arturo Pérez-Reverte’s novel El problema final, the story traps thirteen people at an isolated hotel near Mallorca in 1959 after a violent storm. When English tourist Elisa Mander is found dead, what first looks like suicide begins to look like murder.

The Final Problem Netflix cast is led by Jose Coronado as Basil, a retired actor who once played Sherlock Holmes on screen. María Valverde plays Adela Figueroa, Martiño Rivas plays aspiring mystery writer Foxá, and Maribel Verdú plays hotel manager Mrs. Ausländer. The ensemble also includes Gonzalo de Castro, Cristina Kovani, José Condessa, Pepón Nieto, Daniel Holguín and Michael Stobbe.

Who is in The Final Problem Netflix cast?

The show is built as an ensemble mystery, which means the cast matters beyond the central detective figure. Basil has experience pretending to solve crimes on screen, but he is not a professional investigator. That difference gives the story a playful connection to classic detective fiction while keeping the murder case grounded in a group of people who all have reasons to be watched carefully.

What is The Final Problem about?

In the spring of 1959, a storm leaves thirteen people stranded on a small island off Mallorca. Their hotel turns into a closed crime scene when Elisa Mander, an English tourist, is found dead. With the weather preventing people from coming or going, the mystery takes on a classic locked-room shape: the killer, if there is one, must be connected to the people already there.

Basil steps into the investigation partly because he spent years portraying a famous fictional detective. His old acting career gives him habits of observation and deduction, but the series can also question how useful theatrical detective logic is when the danger is real.

Is The Final Problem a Sherlock Holmes adaptation?

No. The title naturally causes confusion because Arthur Conan Doyle wrote a Sherlock Holmes story called “The Final Problem.” Netflix’s 2026 series is instead based on Arturo Pérez-Reverte’s novel El problema final. Sherlock Holmes is still relevant inside the plot because Basil once played Holmes as an actor, but this is not a direct adaptation of Conan Doyle’s story.

How closely is the Netflix series connected to Arturo Pérez-Reverte’s book?

Netflix describes the series as an adaptation of Pérez-Reverte’s bestselling novel and keeps the core period mystery, island setting and actor-turned-investigator premise. Because the show runs only four episodes, it is structured as a compact limited series rather than a long procedural.

Who is Basil?

Basil is the character who gives The Final Problem its most distinctive angle. He is not Sherlock Holmes. He is an aging actor who once became famous for playing Holmes. When the death at the hotel starts to look like murder, Basil begins using the habits and reasoning associated with his old screen roles.

Where and when is The Final Problem set?

The series takes place in 1959 at a secluded hotel on a small island near Mallorca. The time period matters because the investigation unfolds without modern surveillance, mobile phones or instant forensic databases. Information has to come from observation, testimony, physical clues and the relationships between the guests.

How many episodes are in The Final Problem?

Netflix has confirmed that the limited series contains four episodes. That makes it a short mystery designed around one central case rather than an open-ended crime drama.

What to know before watching

The strongest reason to watch is the combination of an old-fashioned ensemble whodunit with a self-aware detective-fiction premise. Viewers who enjoy mysteries tied to literary characters may also like our Enola Holmes 3 cast and story guide and Moriarty in Enola Holmes explainer.

Why the hotel becomes a classic closed-circle mystery

The storm is more than background atmosphere. By isolating the hotel, the story removes the easiest escape routes and narrows the suspect pool. Nobody can simply leave when questions become uncomfortable, and outside help cannot instantly solve the case. That structure allows the series to focus on alibis, hidden relationships, contradictory accounts and the small details Basil notices as people begin watching one another.

Who are the key suspects and allies?

Basil and Foxá form the clearest investigative pairing in Netflix’s synopsis, but that does not make everyone around them an automatic suspect. Adela Figueroa is deliberately described as mysterious, Mrs. Ausländer has authority over the hotel, and Fonseca is an ambitious film director. The limited-series format means even supporting guests can matter because there are only four episodes in which to place clues and reversals.

Why Basil is not simply Sherlock Holmes

Basil’s old Sherlock role gives him a vocabulary for deduction, but acting as a detective is not the same as investigating a real death. A performance can be rewritten if the scene does not work. A real accusation can destroy someone. That gap between fiction and reality is one of the most interesting ideas in the premise and should help the series avoid becoming a copy of a familiar Holmes adaptation.

What makes the 1959 setting important

The period setting limits technology and forces people to rely on memory, observation and conversation. There is no smartphone location history to settle an alibi and no instant database search to identify every guest. The hotel itself becomes the information system: who saw whom, who had access to a room, who heard something during the storm and who is lying about why they came to the island.

Is The Final Problem suitable for viewers who have not read the book?

Yes. Netflix presents the series as a self-contained mystery, so knowing Arturo Pérez-Reverte’s novel should not be required to understand the plot. Readers of the book may notice how characters or clues have been adapted, but newcomers can approach the four episodes as a standalone whodunit.

What not to confuse this series with

Search results for ‘The Final Problem’ often surface Arthur Conan Doyle, Sherlock Holmes adaptations or older screen versions using the same phrase. To find the 2026 Netflix title, include terms such as Jose Coronado, Arturo Pérez-Reverte, Netflix 2026 or El problema final.