I highly recommend this book for those who want an insider account of the Iranian revolution of 1979. It includes detailed information about the takeover of the U.S. embassy by Iranian student radicals. We have not had formal diplomatic relations with Iran since then.
The book suggests the problems a U.S. president has in balancing many issues at any one time. For example, the Camp David Accords between Egypt's Anwar el Sadat and Israel's Menachem Begin were taking place even as problems in Iran mounted. It's sobering to realize that crises sometimes occur because too many events are happening at the same time.
The book highlights the assumptions our culture makes and our surprise when those assumptions are proved wrong. We found out that diplomatic missions are not necessarily respected as they had been for centuries. Even during the outbreak of World War II, American diplomats in hostile territory were given safe passage. Not so anymore.
We also discounted how important one's culture is and how the inroads of free wheeling Western lifestyles can offend. This has happened in most Middle Eastern countries to one degree or another.
The embassy takeover was more than a decade behind us when I began my service with the U.S. Foreign Service, but I served with a former hostage as well as one of the six who escaped with the help of the Canadians. (The movie Argo was loosely based on their experiences.) It created scars within both the Foreign Service and the American psyche.