The Secret Hours by Mick Herron

A hostile prime minister launched the Monochrome inquiry two years earlier to investigate historical over-reaching by the British Secret Service. Griselda Fleet and Malcolm Kyle were seconded to Monochrome and given access to classified archives, but MI5's First Desk blocked their work and the probe collapsed. On the eve of its closure an unexplained MI5 file surfaces, revealing the buried history of a classified 1994 Berlin operation that ended in tragedy and scandal and whose cover-up has rewritten thirty years of Service history.

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