The explosive sequel to the bestselling The Turing Protocol asks a chilling question: what happens when the power to rewrite the past becomes a weapon?

Nautilus is no ordinary machine. Created by Alan Turing during World War II, it can send messages eight weeks back in time—a discovery so dangerous that Turing established strict protocols for its use. Only members of his bloodline can operate it, and only to prevent global catastrophe.

For decades, the rules have held.

Until now.

Annabelle Turing has inherited custody of Nautilus, unaware that the man she trusts most—her husband, Edward—has secrets of his own. Edward sees the machine not as a safeguard for humanity, but as the key to unimaginable wealth, influence and control.

But he isn’t the only one hunting Nautilus.

Across the globe, shadowy factions are closing in, determined to exploit the machine’s power to manipulate markets, topple governments and reshape history itself. As rival forces converge, Annabelle is thrust into a deadly race against time to protect the one invention capable of saving the world—or destroying it forever.

Because once the past can be controlled, no future is safe.

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About the Author

Nick Croydon was born in Surrey, England, and is the CEO of QBD Books Australia, the country’s largest book retail chain with 91 stores nationwide. He has more than 25 years’ experience running international publishing companies and book retail businesses across the United Kingdom and Australia.

Writing has always run alongside the business of books. The Turing Protocol, his debut novel, became a bestseller and drew praise from some of Australia’s most celebrated thriller writers. Nautilus is his second novel.

Croydon is a father of four and husband to Esther. He and his family divide their time between Brisbane, Spain and the UK.