Netflix has released the trailer for The Final Problem, a four-episode mystery arriving September 25. The story starts with thirteen people trapped on an island near Mallorca, then turns a suspicious death inside their hotel into a murder investigation.
The series adapts Arturo Pérez-Reverte’s novel of the same name and uses a 1959 setting to keep the suspects cut off from the outside world. There is no quick police response waiting outside. Whoever killed Elisa Mander is still in the building.
A storm turns the hotel into a locked room
The guests and staff are stranded when a violent storm hits the island. Elisa Mander, a quiet English tourist, is found dead, and the scene initially looks like suicide. That explanation starts to fall apart as the details point toward murder.
The setup is classic locked-room mystery territory, but the hotel gives it a specific shape. Everyone arrived with a reason to be there, everyone is stuck together, and every conversation can change the way the group sees the death. The trailer keeps moving between elegant rooms, uneasy glances, and the weather blocking the only way out.
Basil is the unlikely detective
Basil, played by Jose Coronado, is not introduced as a professional investigator. He is a retired actor who once played Sherlock Holmes on the big screen. When the death needs to be examined, his most famous role becomes an unexpected source of confidence and suspicion.
That detail gives the series a fun tension. Basil knows how a detective is supposed to behave, but knowing the performance is not the same as knowing who is lying. He joins forces with Foxá, an aspiring thriller writer played by Martiño Rivas, and the two start searching the hotel for a real answer.
The cast gives every suspect a different reason to worry
Maribel Verdú plays Mrs. Ausländer, the hotel’s manager, while María Valverde plays Adela Figueroa, a young woman traveling with a friend. The wider ensemble includes Gonzalo de Castro as an ambitious film director, Cristina Kovani as a young actress, José Condessa, and Pepón Nieto.
The point is not that every character is secretly a killer. The point is that the group has no neutral space left. Guests, employees, artists, and visitors all have private histories that become relevant once one of them is dead.
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The 1959 setting changes the pace
The Final Problem is set before smartphones, instant searches, and modern forensic shortcuts. That does not make the mystery impossible; it makes the people in the hotel depend on memory, observation, and whatever evidence they can find themselves.
The period backdrop also keeps the story focused on the hotel. The trailer is more interested in rooms, windows, books, and faces than in a large outside world. The storm is not just atmosphere. It is the reason the suspects have to keep looking at each other.
What Netflix confirmed
The Final Problem premieres on Netflix September 25 and consists of four episodes. It is directed by Félix Viscarret and produced by Mod Producciones. The series is based on Pérez-Reverte’s bestselling novel and stars Coronado, Verdú, Valverde, and Rivas in the main ensemble.
Netflix has also confirmed the central murder, the island setting, Basil’s former Sherlock Holmes role, and the fact that every guest and staff member can become a suspect. It has not revealed the killer or explained how closely the series will follow the book’s final answers.
The trailer leaves the biggest question open
The trailer shows a group trying to solve a murder before the storm clears, but it does not tell us who killed Elisa Mander or whether Basil’s past as Sherlock Holmes helps him or gets in the way. It also leaves the relationships inside the hotel deliberately blurry.
The series arrives as part of a busy month for Netflix. Our September 2026 streaming guide has more upcoming movies and shows to watch alongside The Final Problem.
A short mystery can still leave room for surprises
Four episodes should give The Final Problem a tight shape: establish the hotel, narrow the suspects, and make the storm feel less dangerous than the people inside. The trailer promises a polished period thriller, but the reason to watch is simpler. Thirteen people are trapped, one of them is dead, and the person responsible may still be listening from the next room.
