Nautilus

4 books in series
3 ratings

The Turing Protocol Summary

In the midst of World War II, Enigma codebreaker Alan Turing has created a machine named Nautilus that can send a message back into the recent past.

After Turing uses it to help the Allied forces succeed on D-Day, he sees the power (and potential danger) of what he has created. He knows he can only entrust it to one person: Joan, the mother of his secret child.

Over the next seventy years, the Nautilus is passed down through the Turing family, who all must decide for themselves when to use this powerful invention. Will it save the world - or destroy it?


‘Thought-provoking. The Time Machine meets Th Da Vinci Code.’ CHRIS HAMMER

‘A ripping tale of “past careens into present” fiction.’ TRENT DALTON

‘A fascinating alternative history with an intriguing “what if” at it’s core.’ DERVLA McTIERNAN
©2025 Nick Croydon (P)2025 W. F. Howes ltd.
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Product list

  • Book 1

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    £14.51 or free with trial. Auto-renews at £5.99/month after trial. See eligibility.

  • The Turing Protocol cover art
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    • The Turing Protocol

    • Discover a past you never thought possible in this gripping, high-stakes historical thriller
    • By: Nick Croydon
    • Narrated by: Leighton Pugh
    • Length: 8 hrs and 58 mins
    • Release date: 04-09-25
    • Language: English
    • 3 ratings

    £14.32 or free with trial. Auto-renews at £5.99/month after trial. See eligibility.

  • Book 2

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    • Nautilus

    • From the author of THE TURING PROTOCOL
    • By: Nick Croydon
    • Length: 12 hrs
    • Release date: 14-01-27
    • Language: English
    • Not rated yet

    £16.58 or free with trial. Auto-renews at £8.99/month after trial. See eligibility.

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  • Nautilus cover art
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    £14.37 or free with trial. Auto-renews at £5.99/month after trial. See eligibility.

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