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|Written by:|| Craig Bartlett|
|Illustrated by:||Tim Parsons|
|Published:||September 1, 2000|
Something strange is happening to the city's water supply, and it's up to Arnold and Gerald to get to the bottom of it. But when they descend to the dark depths of the sewer system and see 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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