BUILT TO PROTECT. NOW BEING USED TO DESTROY.

GREYWIND monitors power grids, ports, markets and networks for signs of pressure before anyone else sees it. Built from classified Key Series data, it is designed to spot threats in the shadows.

Then a Baltic port suffers what looks like a routine fault. Locals log it and move on.

GREYWIND does not.

The system identifies the event as a near-perfect match to a Key Series scenario that should never exist in the real world.

MI5 officer Sarah Sterling is ordered to contain the story before hard questions begin. To do that, she turns to the one person who knows how close the original Key Series operation came to disaster.

Former SAS operator James O’Neill.

As GREYWIND flags similar events across Europe, James and Sarah uncover a pattern hidden inside a rising series of “accidents”. Someone understands the Key Series playbook. Someone is testing the country’s critical infrastructure.

Every small failure looks like a rehearsal for something far worse.

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