Horrible Harry is a popular children's book series written by Suzy Kline which is used in Americanelementary schools for teaching reading. It is based on a 3rd grader named Harry, and his misadventures are told through the words of his best friend, Doug. Harry's and Doug's friends are Sidney, Song Lee, Mary, Ida, and Dexter. His teacher is named Ms. Mackle. His principal's name is Mr. Cardini. The first Horrible Harry book was published in 1988. Her latest book is dedicated to Castlewood P.S.186Q Bellerose.