The Rise of Germany, 1939-1941: The War in the West by James Holland
This is part of a planned trilogy; I have already ordered book two. Holland is a novelist, so holds your attention, even tough the book goes into great detail about the first three years of WWII. He focus not only on the leaders on both sides, and the battles, but the men in the lower ranks.
His account is balanced as good history should be. He is not afraid to point out mistakes and errors by both sides. Though I have an Med in history and am well versed in War Two, I learned a great deal. I highly recommend it.