The Secret of Dinswood - The Dinswood Chronicles, #1

Desperate to get away from a home where she no longer feels wanted, twelve-year-old Emma Higsby is elated when she wins a scholarship to the prestigious Dinswood Academy boarding school. Emma quickly falls in love with the renovated castle nestled in the heart of the mountains. But when rumors surface that her new school is having financial problems and may have to close, she begins to search for a way to save her new home.
When she discovers a riddle of buried treasure left by the eccentric school's founder, Lord Dinswood, she and her friends must use their courage and intelligence to solve each clue. But someone else is searching for the treasure as well. Emma and her friends will have to race against time and discover the secret of Dinswood first!