They do more than frighten birds. Much more.Early one morning in the fall of 1964, Robert searched for his missing six-year-old daughter, Cathy. He found her asleep in a nearby cornfield, covered in blood and holding a small axe. A few feet away lay the mutilated body of her classmate Emily.Assumed guilty of murder, Cathy lived in a hospital for insane children. She always gave the same account of what happened. She talked of murderous scarecrows that roamed the cornfield on moonlit nights. Her doctors considered her delusional. The police, her neighbors and the press thought she was dangerous. And so she remained incarcerated. No one believed her. That was a mistake.