Louise Fitzhugh

Harriet M. Welsch has just received the best news of her eleventh year—Ole Golly is coming back! Harriet can still remember how sad she was when her beloved nanny married George Waldenstein and moved away. But the circumstances of Ole Golly’s return remain unclear. Where is George Waldenstein?
   With Mr. and Mrs. Welsch living in France for three months, Sport confiding that he has a crush on a girl at school, and the arrival...

Harriet the Spy refuses to become ruffled when an unidentified person starts leaving disturbing notes all over the quiet little beach town of Water Mill. She’s determined to discover the author of the notes. And she drags her friend, mousy Beth Ellen, into all kinds of odd and embarrassing situations in her efforts to reveal the culprit. Observing in her own special, caustic way with her ever-present notebook, Harriet the Spy is on the case....

When her married nanny returns to take care of her while her parents are away in France, Harriet hears something curious that makes her think Ole Golly is in some sort of trouble and so must get to the bottom of the matter to make sure her beloved nanny is okay. .