Greywind was built to protect the UK. Fed with Red Team data from the classified Key Series exercises, the system watches power grids, ports, markets and networks for signs of quiet pressure. It is meant to stay in the shadows. It is meant to stay under control.

Then a Baltic port suffers a "minor" power disturbance. Lights dip. Radar blinks. A container ship comes too close to a loaded tanker. Locals log it as a fault. Greywind calls it a near-perfect match to a Key Series scenario that should never touch the real world.

Sarah Sterling is pulled out of London and told to contain the story before anyone asks hard questions. To do that, she goes back to the one person who knows how close Key Series came to going wrong. James O'Neill, former soldier, former Red Team operator, now hiding in the Highlands and trying to stay out of government work.

As Greywind starts flagging more events across Europe, James and Sarah move between GCHQ, a private security giant called Aegis Horizon and a trail of "glitches" that look less and less like accidents. Someone is leaning on systems in a way that feels planned. Someone who understands the Key Series playbook from the inside.

If they are right, every small outage is a rehearsal. If they are wrong, they will have turned a classified clean-up into a public crisis.

To find the truth, James has to read the pattern in live attacks while Sarah fights to keep Greywind from being shut down or stolen out from under them. Both of them know that the next quiet failure might not stop at flickering lights and frozen screens.

The Grey Wind is a tense British espionage and cyber thriller about modern conflict, silent pressure on critical infrastructure and the cost of using your own worst ideas as a shield. Perfect for readers of Lee Child, Mark Greaney and Tom Clancy who want special forces tradecraft colliding with the digital battlefield.

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