Harriet the Spy was controversial when it came out in the 60s, says Anita Silvey, author of 100 Best Books for Children, in part because Harriet was a very flawed character. Some critics hated the book, and some schools even banned it. Harriet saw too much, said too much. She even threw temper tantrums and had to visit a psychiatrist. But Silvey says that that's all part of Harriet's charm.