I'm in the process of reading an excellent book: Catastrophe, by Max Hastings. It deals with the July 1914 crisis and the events leading up to the war, as well as the opening months of the war itself. It's not just about the western front; it also has a lot about Russia, Serbia and Austria.
Max Hasting is undoubtedly the best war historian I have read. I would trust his books over almost anyone else's.
That said, you'll find any book on World War I easier to understand if you know a little of 19th Century European history, and especially the rise and decline of the great European empires. In that regard, I would recommend A History of Modern Europe, by John Merriman.
Whatever you end up reading, I hope you enjoy learning more about this period as much as I am.
Mike
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