The Mystery on Observatory Hill
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On a summer trip to Germany, ace junior detectives Elizabeth and Jonathan Pollack uncover their biggest case ever. When their family moves into a guesthouse on Observatory Hill, a research park for astronomers in Munich, they can't resist investigating the story of a lost treasure — a scientific treasure, that is. Elizabeth and Jonathan are fascinated by the legend of the eccentric Professor Vollrath, who hid his valuable astronomy journals. After he died in the 1919 Spanish Influenza epidemic, his scientific notebooks were never found. The sister-and-brother team discover a string of hidden clues with help from their new German friend, Peter. As the three sleuths hunt for the long-missing notes, they stumble onto a deeper mystery that will take them on the adventure of their lives.
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