"The Mandie books are great. I love all of Mandie's exciting adventures. When I start to read one, I can't put it down!!!!" writes a young Australian reader.When Mandie and Celia left the United States to spend the summer traveling with Mrs. Taft through Europe, they didn't expect that each new place they visited would have a mystery and adventure all its own. But since boarding the Queen Victoria, it's been one episode after another.Traveling from Switzerland to Germany with Jonathan, Uncle Ned, and Senator Morton, they arrive at the medieval stone castle of Baroness Geissler. None of them know much about the castle, but with its many turrets, long narrow slits for windows, a drawbridge and moat, it's not a surprise when they discover there's a mystery surrounding it. A very old juniper tree that's located on the property is said to "jump" sometimes, and no one knows why.What is the secret of the jumping tree? And why is the baroness's grandson so rude and unlikeable?Will Snowball help them solve the mystery?