The Spy in Moscow Station

This is the true story of unorthodox, underdog intelligence officers who
fought an uphill battle against their government to prove that the KGB had
pulled off the most devastating and breathtakingly thorough penetration of U.S.
national security in history.

Incorporating declassified internal CIA memos and
diplomatic cables, this suspenseful narrative reads like a thriller—but real
lives were at stake, and every twist is true as the US and USSR attempt to
wrongfoot each other in eavesdropping technology and tradecraft. The book also
carries a chilling warning for the present: like the State and CIA officers who
were certain their "sweeps" could detect any threat in Moscow, we
don't know what we don't know.