James O'Neill writes modern British espionage thrillers centred on intelligence operations, cyber threats, national security and covert action.

He draws on more than 15 years of UK military service, including over a decade in UK Special Forces, followed by work in close protection, security and intelligence.

The Key Series follows former SAS operator James O'Neill and MI5 officer Sarah Sterling through connected threats involving GCHQ, hostile-state activity, critical infrastructure and modern intelligence warfare.

The Lost Key begins the series. The Grey Wind expands the threat across Britain and Europe. The Ghost Key raises the stakes further. Book four is in progress.

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