Sting of the Scorpion by Lawrence Frederick Hebb

The Army doesn’t want them, they’re too much trouble!
MI6 does, they’re the best at what they do, and they need the best.
MI6 has a problem.

A missing agent. Kidnapped and taken to hostile territory for interrogation.
Only one option is open, and that’s a high-risk rescue operation over two hundred miles into hostile territory with no support.

A ‘do or die mission’ where the stakes are high and failure isn’t an option.