The Three Investigators Kids, 89, In the Ghost Garden

Justus, Peter and Bob are best friends and detectives! Together, the three ??? have solved many tricky cases.
All of Rocky Beach is sweltering in the summer heat when a few eerie tourists appear in town. They behave extremely strangely, fly their drones, roam through the woods and fields, and seem to be looking for something. To top it all off, old city maps are also stolen from the mayor's office. The three ??? Kids wonder: What's going on here?

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Manufacturer / Responsible person:
Franckh-Kosmos Verlags-GmbH & Co. KG, Pfizerstraße 5-7, 70184, Stuttgart, Germany, kosmos.de/servicecenter