Michael Oren, Israel’s former ambassador to the United States, has written the smartest and juiciest diplomatic memoir that I’ve read in years, and I’ve read my share. The book, called “Ally,” has the added virtues of being politically relevant and historically important. This has the Obama administration—which doesn’t come out looking too good in Mr. Oren’s account—in an epic snit.

The tantrum began two weeks ago, when Mr. Oren penned an op-ed in this newspaper undiplomatically titled “How Obama Abandoned Israel.” The article...