Harriet M. Welsch is a spy. In her tebook, she writes down everything she kws about everyone, even her classmates and her best friends. Then Harriet loses track of her tebook, and it ends up in the wrong hands. Before she can stop them, her friends have read the always truthful, sometimes awful things she's written about each of them. Will Harriet find a way to put her life and her friendships back together?