Period piece about an eternal dilemma - marrying one woman out of duty because the gears were in motion and she's perfectly pleasant, then developing feelings for an unattainable other. Nuland Archer, a wealthy pillar of society is tempted to break the rules and take up with the scandalous divorcée he fancies whom he imagines to be much more exciting than his less intellectual wife. However, he is defeated by the rules of society that he has internalized, his wife who epitomizes those rules and his potential lover's basic decency, unwilling to break up a marriage.
Frankly, there was no guarantee of sustained happiness in the alternate "road not taken" where Nuland ran off to Europe with a woman he barely knew, whom he imbued with romantic perfection compared to his conventional wife. Passion may have faltered if he found his idealized "Dulcinea" to be as boring as his wife over interminable meals together. As it is, he obviously made the best of his marriage bed, resulting in three children with whom he had a loving relationship. After his wife's death he realized she had been more astute about his longings for another than he guessed (and wished to restore him to his lost romance by confiding in their son). Too bad Nuland underestimated her insight into him and spent his life pining for an ideal that may not have been all tha, overlooking the possible gem in front of him.
A frivolous observation - Michelle Pfeffier's frizzy hairdo may have been authentic to the time but unflattering and unsexy. Winona Ryder and even minor female characters had more elegant coiffeurs.