Menace at Mammoth Cave — Mary Casanova

Kit is in Kentucky to visit her brother, Charlie, and her Aunt Millie. She's looking forward to riding horses and touring Mammoth Cave. But trouble has come to the quiet Kentucky hill country, and with locals blaming the CCC workers, Kit fears that Charlie's life is in danger. Then Kit discovers that the culprit may be someone she knows. Soon, Kit isn't sure who she can trust. But one thing is certain: she's got to find the culprit -- before things get worse.