If you seek a broader view of counter intelligence matters then Christopher Andrew’s Defence of the Realm is worth the effort to read.
I Pledge Allegience by Howard Blum is an account of the Walker family’s activities.
On a slightly different tack, the recently published Agent Jack by Robert Hutton describes a little known MI5 operation of World War 2. It is not the easiest of reads and is thought provoking.
Finally, there is Geoffrey Prime, former RAF serviceman and GCHQ spy who was never “caught”, but was turned in by his wife after he was arrested for paedophilic offences. It is interesting that the parole board were happy to conclude that a man who had lived most of his life by deception no longer posed a danger and released him on licence.
YS