Justus, Peter and Bob are allowed to visit the famous Professor Hamilton in his giant greenhouse. But suddenly the professor has disappeared, kidnapped by two mysterious men. The three ??? must absolutely free him and save his research results before they fall into the wrong hands. A new dangerous adventure begins.
|Product type||Children's + Teenage books|
|Genre||Children's & Youth Book|
|Number of pages||128|
|Minimum age||8 years|