"When I grow uo I'm going to find everything about everybody and put it all in a book." So whites Harriet M. Welsch, who is determined to grow up to be a famous author. In the meantime, she practices by following a regular spy route each day and writing down everything she sees in her secret notebook. "Janie gest stranger every day. I think she might blow up the world. Once I saw Miss Elson when she didn't see me and she was picking her nose." Then one morning, Harriet's life is turned upside down. Her classmates find her spy notebook and read it out loud. Harriet's in big trouble. The other sixth-graders are stealing her tomato sandwiches, forming a spy-catcher club, and writing notes of their own - all about Harriet!