Something strange is happening to the city's water supply. It is up to Arnold and Gerald to find out what. When they descend to the depths of the sewer and discover the Sewer King, an even bigger mystery unfolds. Will Arnold and Gerald be able to save the city's water supply before it's too late?
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Höhe: 195 mm
Breite: 128 mm
ISBN-13
978-0-7434-0409-9 (9780743404099)
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