The Three Investigators, The Secret Stairway

Why was the young scientist Davy Swany kidnapped? And why did the masked perpetrators always call him Philippe? Justus, Peter, and Bob take up the trail. This leads them to the labyrinthine university building with secret staircases and a gloomy library. Here, the three investigators stumble upon a strange book and peculiar verses. Of course, the three successful detectives from Rocky Beach crack the riddle. But then the difficulties only begin... .

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