Comment by 29athrowaway

If you like this then you will probably like "The Cuckoo's Egg: Tracking a Spy Through the Maze of Computer Espionage", a 1989 book by Clifford Stoll.

Also available as audiobook, and a documentary ("The KGB, The computer and Me"). https://www.youtube.com/watch?v=Xe5AE-qYan8