The Mystery of Pony Hollow — Lynn Hall

Sarah Elgin doesn't believe in ghosts--until she explores her family's new farm and hears a frantic whinnying from an empty old stone house. Determined to rescue the animal trapped inside, Sarah breaks open the door and is shocked to find a dusty old pony skeleton instead. What was making that noise? As Sarah searches for the answer to this haunting question, she uncovers an old secret and discovers that not every mystery has an earthly explanation.