investigators on the list
The truth always leaves a trace.
Real cases and suspense fiction, narrated in audio, episode by episode. Listen to the case file, decide what happened and keep the evidence in your archive.
- Start free
- Spanish and English
- iOS and Android
How it works
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01
Listen
Each case is told in short episodes, with a transcript that follows the voice word for word.
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02
Decide
Every episode ends with a question about what you just heard. Then the reveal comes.
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03
Collect
Finishing an episode unlocks its evidence card: common, rare, epic or legendary.
One minute. One question. One piece of evidence.
The first episode of four case files, exactly as it sounds in the app. Pick one, put on your headphones and answer at the end.
Frequency 88.6
Real case files. Fiction that unsettles.
Documented crimes, told with the sources in front of us, and original suspense stories written for Nocturo.
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Real case · 1888 · United KingdomJack the Ripper
Five women murdered in Whitechapel, letters signed with a name that went around the world, and no culprit.
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Real case · 1968-1969 · United StatesThe Zodiac Killer
A man who turned his crimes into a game with the press: letters, ciphers and a name he chose himself.
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Fiction · Local station
Frequency 88.6
A late-night show, twelve listeners and a voice describing your house in far too much detail. 58 minutes left.
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Real case · 1969-2020 · United States51 Years Inside a Cipher
340 symbols mailed to a newspaper. Half a century of failed attempts and a solution so simple nobody saw it.
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Real case · 1940-1957 · United StatesThe Man in the Double-Breasted Suit
The first criminal profile in history, written without ever seeing the suspect. So precise it looked like a carnival trick.
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Fiction · Cantabrian coastThe Lighthouse of Lost Souls
A distress call from a lighthouse that has been dark for twenty years, with nobody inside.
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Real case · 1974-2018 · United StatesThe Killer's Family Tree
An ownerless DNA profile, 44 years of silence and a website built to find distant cousins.
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Real case · 2006 · ArgentinaThe Heist of the Century: Banco Río
Toy guns, hours of negotiating with the police and an escape through a tunnel without a single shot fired.
Every episode leaves a clue.
Illustrated cards built around the real objects of each case: the memo, the letter, the cipher. They're kept in your album, sorted by case file and by rarity.
- Common
- Rare
- Epic
- Legendary
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Macnaghten MemoThree names in an internal report. None of them ever reached trial.
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Z408 Cryptogram408 symbols across three newspapers. A couple from Salinas cracked it in days.
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"Dear Boss" LetterRed ink, a mocking tone and a signature the world would never forget.
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The Last Lighthouse Keeper's DiaryA set of sea coordinates and a single sentence: "Don't light the lamp."
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Toy GunsReplicas used to take over a bank without firing a single bullet.
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Police NoticeLeaflets door to door: "Residents are asked to report anything suspicious."
We'll let you know when the first case file opens.
Leave us your email and we'll write when Nocturo is on the App Store and Google Play. Nothing else.
Case file registered.
We'll write to as soon as Nocturo is available.
What people usually ask us.
What's the difference between real cases and fiction?
Real cases are based on historical and court records, and they don't invent facts. Fiction is original suspense written for Nocturo. In the app you always know which one you're listening to.
How much does it cost?
Downloading the app and starting to listen is free. A Premium subscription unlocks every case file, and you can also buy a single case on its own.
Which platforms will it be on?
iOS (App Store) and Android (Google Play), in Spanish and English.
What do you do with my email?
We only use it to tell you about the launch. You can ask us to delete it whenever you want by writing to privacidad@nocturo.app.