Is Osama bin Laden a rebel against the Saudi Arabian ruling class or a model member of it? That question lurks behind “The Bin Ladens,” by the Pulitzer Prize-winning New Yorker writer Steve Coll. The world’s most famous terrorist owes his fortune and his standing to a family business that Coll calls “the kingdom’s Halliburton.” Like Halliburton, the Saudi Binladin Group specializes in gigantic infrastructure projects. Government connections are the key to the family’s wealth. So you would assume they would react with unmixed horror to a radical son, like the duchess in the Noël Coward song:

You could have pierced her with swords
When she discovered
Her youngest liked Lenin
And sold the Daily Worker near the House of Lords.

But Saudi Arabia, Coll shows, is a place where the interests of rulers and revolutionaries are less easy to distinguish.