I forgot to bring my Liane Moriarty novel Three Wishes on vacation, but my wife came to the rescue and lent me her Jojo Moyes novel One Plus One, which uses a dysfunctional family road trip (think Little Miss Sunshine) as a catalyst for the most unlikely modern romance: across the great divide of social class . . . this kind of cross-class romance has become statistically rarer and rarer in modern times, as people are tending to marry people of the same educational background and the same financial bracket; in "Equality and the End of Marrying Up," Katrin Bennhold sums it up neatly: "Doctors used to marry nurses . . . now doctors marry doctors," but if you're willing to suspend your disbelief for a few hours, One Plus One will make you root for the underdog relationship, and there are plenty of plot twists and well drawn characters and wild scenarios along the way . . . one hundred and two pairs of reading spectacles out of a possible one hundred and six.