"When a lifeless body is discovered in the concealed passages of the former MI5 headquarters at 140 Gower Street, it unleashes a chilling revelation: the deceased agent vanished without a trace during the tumultuous years of the early 90s. Now, Sam Tilson and his comrades at the Office of Inconclusive Covert Enquiries (ICE) must join forces with DI Alex Crawford of SO15 (formerly Special Branch) to untangle this enigmatic Cold War Cold Case. How did the agent meet his demise? Who orchestrated his demise? And above all, why?"