Digital Fortress: A Thriller

Name: Digital Fortress: A Thriller
Price: 2.99 USD
Availability: InStock
Rating: 4.3 (18658 reviews)
Author: Dan Brown

by Dan Brown

Thriller Science Fiction

4.3 (18,658)

4.3 stars from 18,658 reviews. One of the highest rated Thriller books we track.

447 pages~7.5 hr readPublished by ASTPublished 1998-01-01

$2.99Deal77% off peak

Last checked: Jun 3, 2026

Price history: $1.99 – $12.99

Good deal — this is near the lowest price we've tracked.

Price range: $1.99 – $12.99

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Fans of these authors will like this...

Robin Cook
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Fans of these books will like this...

The Hunt for Red October
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Perfect for you if...

You love high-stakes techno-thrillers with real-world institutional tension and don't mind dense passages about encryption and code-breaking.
You're drawn to stories where a single protagonist must navigate betrayal from within a powerful organisation whilst racing against a ticking clock.
You enjoyed Dan Brown's later work and want to see where his formula of research-heavy plotting and globe-trotting action started.

Maybe not for you if...

You find technical jargon about cryptography tedious rather than thrilling, even when it's in service of the plot.
You're looking for character development and emotional depth. Susan Fletcher is competent but somewhat one-dimensional.
You prefer mysteries where you can piece together clues alongside the protagonist. This one often withholds information for late-book reveals.

About this book

Digital Fortress is a thriller by Dan Brown that focuses on the National Security Agency (NSA) and its code-breaking operations. When the NSA's code-breaking machine encounters a mysterious code it cannot break, the agency calls Susan Fletcher, its head cryptographer and a brilliant mathematician. Fletcherunccovers a shocking discovery: the NSA is being held hostage by a code so complex that its release would cripple U.S. intelligence. Caught between secrecy and deception, she fights to protect the agency while being betrayed from multiple sides. Her struggle becomes personal as she battles for her country, her life, and the life of the man she loves. The story spans from the NSA's underground corridors to Tokyo and Spain as characters race to destroy an impregnable code-writing formula that threatens to destabilize the post-Cold War balance of power.

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Price History

Kindle price over time. Green zones = periods when the book was free.

$1.99 – $12.99

Currently on sale at $2.99 — 77% off peak. Price has dropped 6 times over the last 6 years. Goes on sale roughly every 307 days. Typically stays discounted for 12 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

Currently #4,145 in the Kindle store — a top-10K bestseller. Climbing the charts — 22% improvement recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

Currently 4.3★ from 18,658 reviews

Gaining approximately 93 new reviews per month. Steady word of mouth growth. Rating has remained stable at 4.3 over the tracking period.

Sale Prediction

Actual Predicted

This book is currently discounted at $2.99. It typically returns to around $12.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.