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The theft of Britain's most closely guarded defence system, the DRONE CODE, was never supposed to be possible.
When a series of apparently unrelated incidents point to a breach inside the intelligence services, MI5 operative Danny Fleet is drawn into a race against an enemy who knows exactly what Britain has built.
Drone Code is Britain's secret Umbrella - a defence system designed to detect, disrupt and destroy AI-enabled drone attacks before they can reach their targets.
But someone has learned how to get inside it.
As Fleet, Campbell and their small team follow a trail of betrayal from London to remote locations, they discover the threat is not simply an attack from outside. The enemy may already be inside the system.
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