A slow moving story with little substance. Olivia Sharp is an "Agent for Secrets," but those expecting a detective story will be disappointed, for Olivia is more of a social worker than an investigator. Her "case" involves few secrets since her client Desiree wants to be Princess of the Fillmore Street School, and everyone knows it. Desiree makes herself obnoxious by insisting that everyone be as perfect as she is. Olivia "solves" the case initially by giving Desiree money for her various projects designed to promote perfection. Since Olivia is wealthy and independent, doling out cash is no problem. Her parents are in Europe and the only adults around--a housekeeper and a chauffeur--exist merely to feed her or to provide transportation. If all this sounds unrealistic and irresponsible, it is. When Olivia finally convinces Desiree to give up her campaign by just telling her that she can't be perfect and bossy, one wonders why that didn't happen 40 pages earlier. The black-and-white illustrations are sprightly, but add little to the colorless plot. Young readers interested in real secrets should stick with Sharmat's own "Nate the Great" series (Coward) or Elizabeth Levy's "Something Queer" series (Delacorte). --Lori A. Janick, Parkwood Elementary School, Pasadena, TX Copyright 1989 Reed Business Information, Inc