This is a history of espionage and betrayal, peppered with real stories, predominantly from the 20th century.
Whilst outlining the difference between a spy and an agent, this book explores the motives for espionage under seven main headings, all of which cross over into each other. So why do spies spy: sex, money, tribal loyalty, revenge, control, ideology, compromise, ego, patriotism, adventure or just the right thing to do.
Some of these larger than life characters I was familiar with from prior reading - though not in such detail as provided here. I was particularly interested in wartime espionage and the Cold War, as we moved further closer to our own time, my interest waned a little - but that was just me as I found the "old school" spycraft was more interesting - the human element rather than the current, modern day cybercrime and whistle-blowing (spying from a distance).
If this is your genre, it well worth the read.