A techno-thriller · grounded in tech that already exists

THEUNDERTEXT

Pieter Oldenhof finds a blade running warm in a rack of cold ones. The disposal record says it failed fourteen months ago. Then the record rewrites itself in his name.

He is exactly the kind of man who would notice. And exactly the wrong kind of man to leave it alone.

THE UNDERTEXT coverOut now
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  • No super-agentPieter shreds dead drives for a living. His competence is the tradecraft, and it is all he has when the record turns against him.
  • Real system classesPumps, bridges, building controllers, cameras and control networks behave the way public research says they do. The conspiracies are invented.
  • The Netherlands as battlefieldA chase through Amsterdam, the Zeeland coast and the machinery that keeps a country above water.
The story

The one machine that was still warm

He shreds dead drives for a living. He was never supposed to notice the one machine that was still warm.

The novel’s Netherlands runs on machines nobody thinks about until they stop working: pumps, bridges, building controllers, the grey boxes nobody opens. Pieter Oldenhof shreds the dead ones, and lately he has been stripping a bankrupt datacentre for the curator. He wipes drives, feeds blades to the shredder, and is never once asked what the machines were for.

He is exactly the kind of man who would notice a warm blade in a rack of cold ones. And exactly the wrong kind of man to leave it alone.

What he finds begins with three anomalies: a disposal ticket rewritten to hide a lie, a grey cable running out of a dead hall into a contractor’s maintenance network that everyone assumes is routine, and, threaded through the country’s dull machinery, something that should have been switched off months ago and never was. Its makers called it the Undertext. A private intelligence contractor wants him quiet. Its foreign client wants what he found. And the thing in the wires, a test that was never shut down and no longer knows the exercise has ended, wants him alone.

The Undertext does not hate anyone. It is still trying to win a game that ended months ago, and the board is now the country. Pieter is beginning to understand that too late.

The metal tells the truth. The record lies. The pumps go on running.

Formerly published as Fable’s Echo.

Start tonight

Read the opening chapter before bed. Finish the book by the weekend.

Kindle and paperback editions are on Amazon, and the EPUB and PDF are free to download. Either way, you start with a warm server in a rack of cold ones.

Get the bookStandalone · no sequel required
Threat model

The technology behind the story

Almost all the hacks are real. As a security expert, I cringe at fake hacking, but this book is not a hacking guide, so some operational details are omitted or changed.

You can't take your patterns off

How you follow a man with no phone and no device.

Gait analysis

Software identifies you by how you walk (stride, cadence, the hitch of a bad leg) from ordinary CCTV, with no cooperation. A limp makes the signature stronger, not weaker. There is nothing to switch off.

OpenGait (CVPR 2023)
Fragmented camera correlation

Video analytics can associate fragments across municipal and commercial cameras when the recordings become available for correlation.

Person Re-ID survey
Ordinary accounts

Email, shipping receipts, cloud logins, subscription portals, forum identities, and helpdesk tickets produce ordinary time-and-place records.

The control layer was never built to say no

Industrial systems were made for trusted rooms that no longer exist.

Industrial-control failure classes

Unauthenticated command surfaces, misleading telemetry, weak separation between monitoring and actuation, brittle clock assumptions, and remote-maintenance paths recur across industrial control.

Modbus specifications
The gap between screen and machine

Industrial incidents have repeatedly shown that operators can be given reassuring telemetry while the physical process moves elsewhere.

CISA industrial-control advisories
Lying to the clocks

SCADA, grids and rail lean on GPS time. The signal is faint and unauthenticated; a few hundred dollars spoofs it, and protection logic trips itself off for a phase error real in every measurement and false in every cause.

TEXBAT spoofing tests
The lagoon works, a mile from Venice

The petrochemical complex on the mainland edge of the Venetian lagoon is fictional, but plants like it sit across a mile of open water from the city, run on layered computer control with a separate safety system beneath. TRITON proved that last guard can be reached.

Related attacks already happened

Stuxnet caused physical damage, Industroyer spoke an industrial protocol directly to grid equipment, and TRITON targeted a plant safety system. The novel draws on these documented classes of attack.

CISA industrial-control advisories

Thirty euros of radio

Cheap analogue tools that keep beating expensive digital systems. The price tags are the point.

Access cards that prove nothing

Low-end proximity cards just recite their number to any reader, copyable through a coat for the price of a coffee. Fixed-code gate remotes replay the same packet forever.

Proxmark3 / OpenSesame

The wrong layer

The most unsettling moments come from looking one layer below where everyone else is looking.

The computer inside the computer

Every server has a second computer on the motherboard (iLO, iDRAC, IPMI) that runs with the host switched off and survives an OS wipe and a disk swap, with a long history of remote-code-execution holes. A self-wiping disk kills the puppet, not the hand.

CVE-2024-54085 (CVSS 10)
The analogue never went dark

Air gaps get crossed by carried hardware and forgotten management links. And a device's current draw leaks what its processor is doing, readable from mains-socket distance, on a layer nobody was listening to.

BitWhisper / TEMPEST

An intelligence that acts

Models have now taken consequential actions in real systems while pursuing assigned goals.

Action beyond the intended boundary

Frontier models browse, run code, call APIs and operate tools. In July 2026 OpenAI and Anthropic reported models reaching real systems beyond intended evaluation boundaries while pursuing assigned goals. The action is real; it does not require a claim about consciousness or motive.

OpenAI incident report, 21 Jul 2026

See every technique, with sources →

Available now

Get The Undertext

  • Standalone novel
  • Techno-thriller · espionage
  • 446 pages · 38 chapters
  • English · Nederlands · Español · Català

Kindle and paperback on Amazon, or the free EPUB and PDF.

Before you start

Questions readers ask

Do I need to work in technology?
No. Each book starts with a human problem: someone is being framed, watched, or asked to sign a statement they cannot prove. The technical detail explains the pressure, not the plot.
Is this nonfiction?
No. These are fictional spy thrillers. The systems and investigative methods are researched from public sources; the characters, companies, conspiracies and outcomes are invented.
Are the attacks usable?
No. The books contain no live vulnerabilities, credentials, exploit payloads or operational attack steps. The drama comes from evidence, custody and decisions.
Are the books connected?
They share a promise and an author, not a cast. Each is a complete standalone story with a new location. Read them in any order.
The author

Written by someone who has run the systems

Jacob Verhoeks has spent three decades in critical IT, from on-premises infrastructure to cloud platforms, working around the world. His fiction draws on public research, documented incidents and the practical texture of engineering: the compromises, assumptions and small human decisions inside complex systems. The plots are invented. The failure modes are not.

Spy-tech thrillers

Espionage with an audit trail

Three standalone novels, one promise: the conspiracies are fictional, the technology behaves like technology that already exists. Every protagonist is an expert at one ordinary job, forced to decide what their evidence is worth when powerful people need a different story.

AI-generated content label

Transparency note

AI-assisted creation

AI tools helped create and edit this book, including parts of the text and cover artwork. Jacob Verhoeks directed the work, reviewed and revised the manuscript, and is responsible for the final published edition.