Many sites offer free Cold War Spy Books for download. Here are a few in no particular order:
Spy Wise offers a previously unpublished revision of O.F. Snelling’s 1964 best-seller then known as James Bond: A Report. It’s in PDF format and is called “James Bond Under the Microscope.”
Download the free e-book by Kristian C. Gustafson titled CIA Machinations in Chile in 1970: Reexamining the Record. Gustafson is a frequent contributor to the CIA’s official periodical, Studies in Intelligence.
Also from Many Books, Troika by Hersch O. Zitt. According to Many Books: “A coalition of intelligence officers from the US, Russia, and Israel work to reveal and defeat a complex web of deception spun by a group of nuclear terrorists — all while protecting Operation TROIKA from rival agencies.”