One morning eight-year-old Martin looks in the mirror and sees a stranger. Overnight, he has changed. His parents take him to one doctor after another, only to be told that there is nothing wrong with their son. At school his teacher asks, "What have we here, trick or treat?" His classmates will not play with him. At home his family tries to treat him as if he were the same child. But things now are different. Martin has grown very old in the space of one day. His world will never be the same again.