Ellen Streater is at the county fair with her friend Caitlin when she sees a fortune teller's trailer and decides to find what the future has in store. The Great Sybil puts Ellen in a trance whereby her hand begins to write of its own accord, in a style that is not her own. What is written is a warning about a ``little one'' in danger, and Ellen suspects that the reference may be to her younger brother, Corey. She discovers that he is trying to catch a thief, a man who will kill Corey and if necessary, Ellen, in order to avoid arrest. But this plucky young heroine has her priorities straight. The result? Kehret (The Richest Kids in Town, 1994, etc.) has created another page-turning adventure. (Fiction. 10+)