A Hidden Enemy

"Rules? They left those behind a long time ago."

They don't exist on paper. That's exactly why MI5 needs them.

A disgraced Russian intelligence officer resurfaces in the UK with a single objective: steal the guidance data for a next-generation missile system. Tom Kessler's team is brought in off the books. Unofficial. Untraceable. Completely expendable if it goes wrong.

It goes wrong.

A brutal attack leaves the team fractured. Moscow escalates, sending a GRU colonel whose presence means this operation is no longer deniable and failure is no longer survivable. Tom's team must turn a compromised insider, track a seasoned illegal, and hold themselves together long enough to execute a high-risk deception, with no margin for error and no backup.

There is no official version of events.

There are only consequences.

A Hidden Enemy is a tightly plotted British espionage thriller built on real intelligence tradecraft, where the threat is state-level, the stakes are global, and the team fighting it officially doesn't exist.