An old -- and not important -- story, but the handling here is far above the usual rental library treatment. A young woman, separated from her husband, has an affair with a man in the Chicago advertising agency in which she works, and from a passing fancy he becomes her real love. She gets a divorce in hopes he will want to marry her and when he makes the jesture, she realizes it is an empty one. Unwilling to take him on this basis, she lets him go off without her to another job in New York. A wide-awake, genuine quality to it all, with underlying feelings below the flippant surface lingo. Upper-cut rentals and a definite woman's book.