A Kind of Prisoner

In this classic spy thriller from an Edgar Award–winning author, a British secret service agency is nearly undone by a counter-espionage attack.
Superspies are out to destroy Department Z. Even worse, the elite British agency has been infiltrated by a double agent. As loyal members of the team turn against one another, Agent Gordon Craigie works to unmask the counterspy before Department Z is annihilated once and for all.