Harriet, the spy

Harriet M. Welsch is a spy. She's staked out a spy route, and she writes down everything about everyone she sees

including her classmates and her best friends

in her notebook. Then Harriet loses track of her notebook, and it ends up in the wrong hands. Before Harriet can stop them, her friends have read the always truthful, sometines awful things she's written about each of them. Will Harriet find a way to put her life and her friendships back together?