Klass has a young family, attends medical school, and writes short stories in her odd bits of time. They are good stories, with likeable, contemporary characters who seem rather baffled by their lives: a husband who fears that he will have to have an affair because he thinks his uninhibited wife is having one; a woman who has rented her upstairs to an old college roommate and her husband, but thinks about asking them to leave because the husband tries to kiss her. Klass is good with characters, writes interesting dialogue, and takes chances, as in ``Nineteen Lists,'' which describes the breakup of an affair through lists: ``Five good reasons for Nicole and Matthew to break up,'' ``Four things which have gone well while they lived together.'' Enjoyable reading recommended for contemporary fiction collections. Margaret B. Allen, M.L.S., West Lebanon, N.H.