Every day on her spy route she "observes" and notes down anything of interest to her:I BET THAT LADY WITH THE CROSS-EYE LOOKS IN THE MIRROR AND JUST FEELS TERRIBLE.PINKY WHITEHEAD WILL NEVER CHANGE. DOES HIS MOTHER HATE HIM? IF I HAD HIM I'D HATE HIM.IF MARION HAWTHORNE DOESN'T WATCH OUT SHE'S GOING TO GROW UP INTO A LADY HITLER.But when Harriet's notebook is found by her schoolmates, their anger and retaliation and Harriet's unexpected responses explode in a hilarious way.