Markings
The memoir of Dag Hammarskjöld, second Secretary General of the United Nations.

Markings is the spiritual memoirs of Dag Hammarskjöld, a public servant who put service to others over his own self-interest.
If you have never heard of this leader, fret not. He was unknown to me until an elderly man gave me a copy of the book over lunch one day and suggested I read it.