Flush by Carl Hiaasen

In the Florida Keys, a boy and his determined sister set out to clear their fisherman father’s name after he deliberately sinks a flashy gambling boat to stop its owner from dumping raw sewage into the bay; when he’s arrested for the stunt, the siblings recruit friends, gather evidence, and use clever, sometimes messy tactics to expose the operator’s pollution and corruption, turning a family quarrel into a community fight to protect the fragile coastal environment.

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