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Table of Contents
About The Book
The greatest weapon of World War II was never a bomb. It was a machine that could rewrite the past.
During the darkest days of World War II, legendary codebreaker Alan Turing creates Nautilus—a secret machine capable of sending messages backwards through time.
One message helps secure victory on D-Day.
But Turing quickly discovers a terrifying truth: history is fragile. Every change creates consequences. Every warning rewrites the future.
Knowing Nautilus could become the most dangerous weapon ever invented, Turing hides it from the world and entrusts its secret to the mother of his hidden child.
For generations, the burden passes from one heir to the next.
Across decades of war, espionage, betrayal, and impossible moral choices, the Turing family must decide when—and whether—to use the machine's extraordinary power. A single message could save millions of lives. A single mistake could unleash catastrophe.
As powerful forces close in and the battle for Nautilus intensifies, one question becomes impossible to ignore:
If you had the power to change history, would you dare use it?
A gripping blend of historical fiction, science fiction, espionage, and conspiracy thriller, this page-turning adventure is perfect for fans of Dan Brown, Matthew Reilly, Blake Crouch, and Andy Weir.
Packed with secret histories, hidden legacies, time-bending twists, and world-changing stakes, this is a thriller that asks what happens when humanity's greatest weapon isn't a bomb—but time itself.
During the darkest days of World War II, legendary codebreaker Alan Turing creates Nautilus—a secret machine capable of sending messages backwards through time.
One message helps secure victory on D-Day.
But Turing quickly discovers a terrifying truth: history is fragile. Every change creates consequences. Every warning rewrites the future.
Knowing Nautilus could become the most dangerous weapon ever invented, Turing hides it from the world and entrusts its secret to the mother of his hidden child.
For generations, the burden passes from one heir to the next.
Across decades of war, espionage, betrayal, and impossible moral choices, the Turing family must decide when—and whether—to use the machine's extraordinary power. A single message could save millions of lives. A single mistake could unleash catastrophe.
As powerful forces close in and the battle for Nautilus intensifies, one question becomes impossible to ignore:
If you had the power to change history, would you dare use it?
A gripping blend of historical fiction, science fiction, espionage, and conspiracy thriller, this page-turning adventure is perfect for fans of Dan Brown, Matthew Reilly, Blake Crouch, and Andy Weir.
Packed with secret histories, hidden legacies, time-bending twists, and world-changing stakes, this is a thriller that asks what happens when humanity's greatest weapon isn't a bomb—but time itself.
About The Author
Photograph © Sarah Hellen Photography
Nick Croydon was born in Surrey, England, and is the CEO of QBD Books Australia. He has more than twenty-five years’ experience running international publishing companies and book retail businesses across the United Kingdom and Australia. The Turing Protocol is his debut novel. Nick is a father of four and husband to Esther, and he and his family spend their time between Brisbane, Spain and the UK.
Product Details
- Publisher: Simon & Schuster Australia (July 29, 2025)
- Length: 320 pages
- ISBN13: 9781761636868
Raves and Reviews
‘What sets the book apart isn’t just its concept, but how it uses that concept to explore modern questions: the responsibility of technology, the moral grey zones of war, and the personal cost of carrying knowledge that could shift the future … Whether you’re into alternative WWII fiction, speculative thrillers, or just looking for a smart weekend read, this is one to check out.’
– Write Finance
‘I had a blast inside Croydon’s no-higher-stakes alt-20th-century playground. A wildly imaginative distortion of deeply researched historical fact forming a ripping tale of ‘past careens into present’ fiction. Urgent morse code message to my past self: READ THE TURING PROTOCOL NOW.’
– Trent Dalton
‘A remarkable debut novel from Nick Croydon. A smart, gripping thriller with an amazing big idea behind it. I loved it and I can’t wait for the movie and the sequel.’
– T.J. Newman
‘An incredible debut thriller where the past can be changed to save the future.’
– Don Winslow
‘A thought-provoking alternative history. The Time Machine meets The DaVinci Code.’
– Chris Hammer
‘Vivid, tense and sharp – Croydon’s concept will leave your mind and morals delightfully tangled.’
– Candice Fox
‘A fascinating alternative history with an intriguing ‘what if’ at its core. A great read.’
– Dervla McTiernan
‘An intriguing mix of extraordinary fact and tense fiction’
– Sunday Telegraph
'Absorbing romp.'
– Good Reading
'The Turing Protocol is as thought-provoking as it is entertaining.'
– Meredith Jaffe
Resources and Downloads
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Book Cover Image (jpg): The Turing Protocol
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Author Photo (jpg): Nick Croydon Photograph © Sarah Hellen Photography(0.1 MB)
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