B1 · Intermediate · A Hidden Clue · 256 words · ~2 min read

📁 The Encoded File

Language focus: Describing discoveries · expressing curiosity

The London Startup Mystery

Before you read

This episode is where speculation enters the story, and speculation in English runs on modal verbs. Notice every point at which Maya is guessing rather than knowing, and which verb marks it.

One quiet afternoon, while tidying the shared drive, Maya stumbled across a folder simply labelled “DR — DO NOT DELETE”. Her curiosity got the better of her, and she opened it. Inside was a single file full of strange symbols and numbers — clearly some kind of code.

The initials “DR” rang a bell. Daniel Reyes. With a flutter of excitement, she flicked through his dusty notebook and found the very same symbols scribbled in the margins. “What on earth were you working on?” she whispered to the empty desk beside her.

She decided to look into it quietly. The code seemed to repeat a pattern, but cracking it felt like searching for a needle in a haystack. Even so, Maya had always loved a good puzzle, and something deep down told her that this one genuinely mattered.

Just then, Tom wandered over. “Burning the midnight oil already, are we?” he joked, even though it was only three o’clock. Maya quickly closed the file and smiled. For reasons she couldn’t quite put into words, she wasn’t ready to bring it up — not yet, anyway.

She copied the first two lines onto a scrap of paper and stared at them on the bus, convinced the pattern would give itself away if she looked long enough. It did not.

What she could not work out was why anyone would encode a design file at all. Either Daniel had been hiding something, or he had been protecting it — and the two possibilities pointed in very different directions.

Key vocabulary (6 words)

foldernoun: A place on a computer where files are kept together.
symbolnoun: A mark or sign that represents something.
codenoun: A system of secret symbols or letters used to hide a message.
marginnoun: The empty space at the edge of a page.
patternnoun: A regular, repeated arrangement of things.
predecessornoun: The person who had a job or position before you.

Phrasal verbs in this episode

stumble across — To stumble across something means to find it by chance.
look into — To look into something means to investigate it.
flick through — To flick through means to look at the pages of something quickly.

Idioms in this episode

ring a bell — If something rings a bell, it sounds familiar and you think you have heard it before.
a needle in a haystack — A needle in a haystack is something that is extremely difficult to find.

The grammar in this episode

Modals of speculation: must, might, could, can’t

Later episodes lean on these heavily, and this one sets them up: either Daniel had been hiding something, or he had been protecting it could equally be written he must have been hiding something or he might have been protecting it. Must = you are almost certain; might and could = it is possible; can’t = you are almost certain it is false.

stumble across and come across

Both mean to find by chance, and both are inseparable — the object always follows the whole verb: stumbled across a folder, never stumbled a folder across. Compare look into (investigate), also inseparable, with flick through (read quickly), which behaves the same way. Learning which phrasal verbs split is as important as learning what they mean.

Past continuous for an unfinished background question

“What on earth were you working on?” Maya is asking about an activity in progress over a period, not a single completed act — which is exactly what the past continuous is for. Note the preposition stays at the end in natural English; on what were you working is grammatical but sounds archaic.

even so and for reasons she couldn’t put into words

Even so concedes the previous point and then contradicts it: the code was nearly impossible, even so she kept going. It is the compact cousin of although and despite this, and it always starts a new sentence rather than joining two clauses.

Phrases you can reuse today

I stumbled across it by accident.: Inseparable phrasal verb: the object follows the whole phrase.
I’ll look into it.: Look into = investigate. Common in workplaces.
That rings a bell.: Idiom: it sounds familiar but you cannot place it.
Even so, I kept going.: Concedes the point, then contradicts it.

Comprehension quiz

What does Maya find on the shared drive?
- An encoded file
- A photograph
- A shopping list
Show answer
An encoded file
Whose initials are “DR”?
- Daniel Reyes
- Diana Roberts
- David Reed
Show answer
Daniel Reyes
“Rang a bell” means the initials…
- made a sound
- seemed familiar
- were wrong
Show answer
seemed familiar
Cracking the code felt like…
- a piece of cake
- a needle in a haystack
- child’s play
Show answer
a needle in a haystack
“Look into” something means to…
- investigate it
- ignore it
- sell it
Show answer
investigate it
Why doesn’t Maya tell Tom?
- She is not ready to bring it up
- She forgot
- He was not there
Show answer
She is not ready to bring it up

Now use it yourself

Reading builds recognition; writing your own sentences is what turns it into something you can actually say. Three short tasks:

Speculate about something unexplained using must have, might have and can’t have.
Use stumble across, look into and flick through in sentences of your own.
Describe something you once found by accident. What did you do next?