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.