From the description:
"Secrets of the Cold War focuses on a dark period of a silent war and offers a new perspective on the struggle between the superpowers of the world told in the words of those who were there. The author, formerly an expert in counterintelligence in US Army Europe, weaves together exciting true accounts of allies collecting enemy information in the East and fighting spies and terrorists in the West."
This is a little short (208 pages) and seems to mainly accounts of incidents, rather than a larger view of the intelligence war that raged over the iron curtain. It has good, but scant reviews (4.4 stars on 11 reviews). The digital list price is $16.99 (Amazon now doesn't give their regular price).