Almost 16 now, Platt's perpetual malcontent still hasn't adjusted to her parents' divorce, her father's subsequent suicide, and her now twice-divorced mother's interest in other men. But younger sister Jenny, who has already told the story of Chloris and the Creeps (1973) and . . . the Freaks (1975), has turned a likable 13; and this episode has a lot to do with Jenny's own blossoming relationship with skateboarder Harold, who takes her to a couple of movies, kisses her once on the nose and once more romantically, and proves a wise and sympathetic sounding board for Jenny's family worries. True to childhood tendencies, Chloris kicks up a fuss when her mother comes home with a new boyfriend, and she spoils Mom's planned weekend trip with the man by taking off defiantly on one of her own. There is much anxiety and tension before both return from their aborted trysts, but Harold helps Jenny see it through. Meanwhile there is too much talk about ""the new world of Women's Lib""--a concept one would hope would be less problematical for girls who have grown up with it than it seems to be for Mr. Platt. Otherwise Chloris, who should be outgrowing these particular sulks, becomes more of a pain--but series followers will be happy to see Jenny coming into her own.