Hidden [Paperback] Enderle, Dotti and Gentry, T.

Twelve-year-old Fiona finds an unopened love letter containing mysterious symbols when she and her parents clean out her recently deceased grandmother?s house. She soon realizes the symbols contain clues to a long-hidden treasure. Solving the mystery requires Fiona to learn more about astronomy and mythology as she discovers evidence of two murders and a kidnapping, encounters a ghost, and eventually finds treasure.