Despite some fifty years now of “experimental fiction,” the majority of current novels I’ve read still aim for the Roman arch structure—but fail miserably. I’m mostly thinking of books in the “blockbuster midlist” category, like Jonathan Franzen’s works. Like the painstaking ratchet of roller coaster cars up the incline, these novels develop complex action and character so meticulously that they are forced to cut loose in the final third, the cars careening downhill in the kin...