James O’Neill is the pen name of a British author of espionage thrillers, drawing on 15 years of experience in UK Special Forces and security services. Based in England, he writes stories shaped by intelligence tradecraft, cyber threats and the pressures facing institutions, with a focus on operators, analysts and private contractors rather than spectacle. His three-book Key Series follows former special forces operator James O’Neill and senior MI5 officer Sarah Sterling as they confront a growing intelligence threat.

The series begins with The Lost Key, in which a stolen GCHQ simulation drive leads to a hunt from Belfast to Warsaw. The Grey Wind continues the story with a covert campaign targeting Western ports, power grids and financial systems, while The Ghost Key follows a hidden threat that survives the original operation. All three novels are available now as Kindle editions, through major eBook platforms and in paperback.

Readers can also purchase ePub editions directly from the author, and join the Briefing List for series background, character information, reading order and the opening of The Lost Key