If you are looking at diplomacy, international history or International Relations, this is an excellent history of the "Twenty Years' Crisis" and so on. It reads like a novel in parts and is just as difficult to put down as War & Peace once you get carried by the tide of humanity that has gone into this story.
Whilst it is is true that this is first and foremost a history of ruling-class diplomacy, it is nevertheless a very good one, and other factors are not ignored, the Bolsheviks, the Turks and the insurgencies in Europe.
Detailed narrative and cogent analysis of the all that happened in Paris in 1919 and all that came out of it, with the aftermath of the peace process and the difficulty of avoiding war for twenty years. Excellent!