Write On, Rosy!

As in Give Us a Great Big Smile, Rosy Cole and others in this popular series, Greenwald's ear is finely tuned to contemporary fads and fashions, which she spoofs brilliantly. Rosy Cole is back, pursuing a career as an investigative reporter and focusing on the school headmistress as the subject for her writing workshop assignment. Ingenuous Rosy's investigation takes on all the characteristics of plain old snooping (with her imagination filling in the gaps between clues) until she comes up with The Secret Life of Dr. G. , a would-be expose of the headmistress's ``illegal orphanage.'' Expressive line drawings amplify the text and give this funny novel a light, inviting appearance. It's an especially good choice for young would-be writers. Ages 8-10. (Dec.)