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The Key #3
The Ghost Key
A trusted insider. A covert cyber bridge. A national infrastructure attack waiting for one final key.
Sarah Sterling has spent years following the hidden threads running through British intelligence.
Now someone wants her stopped.
After an attempt on her life, Sarah and former SAS operator James O’Neill uncover evidence that a supposedly dismantled intelligence network is still active. A hidden server is communicating with government infrastructure. A cyber operation targeting the UK power grid is moving towards activation. And the people behind it may already be inside the system.
As James works the operational trail and Sarah builds the intelligence case, two very different betrayals begin to emerge.
One driven by choice.
One driven by coercion.
Both capable of bringing the same devastating result.
With GCHQ racing to understand the threat and an old adversary moving in the shadows, James and Sarah must close the network before the final key is delivered.
Because this time, the greatest danger is not the enemy outside.
It is the person already trusted inside.
The Ghost Key is Book Three of The Key Series, a fast-paced British espionage and techno-thriller series where intelligence operations, cyber warfare and national security collide.
For readers of Tom Clancy, Mark Greaney, Charles Cumming and David McCloskey.
Sarah Sterling has spent years following the hidden threads running through British intelligence.
Now someone wants her stopped.
After an attempt on her life, Sarah and former SAS operator James O’Neill uncover evidence that a supposedly dismantled intelligence network is still active. A hidden server is communicating with government infrastructure. A cyber operation targeting the UK power grid is moving towards activation. And the people behind it may already be inside the system.
As James works the operational trail and Sarah builds the intelligence case, two very different betrayals begin to emerge.
One driven by choice.
One driven by coercion.
Both capable of bringing the same devastating result.
With GCHQ racing to understand the threat and an old adversary moving in the shadows, James and Sarah must close the network before the final key is delivered.
Because this time, the greatest danger is not the enemy outside.
It is the person already trusted inside.
The Ghost Key is Book Three of The Key Series, a fast-paced British espionage and techno-thriller series where intelligence operations, cyber warfare and national security collide.
For readers of Tom Clancy, Mark Greaney, Charles Cumming and David McCloskey.
328 pages, Paperback
Published August 23, 2026
About the author
James O'Neill
3 books4 followersJames O'Neill writes British espionage and cyber thrillers, drawing on decades of research into intelligence tradecraft, security consulting and modern intelligence threats.
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