In "Flush" by Carl Hiaasen, the story revolves around a young girl named Noah Underwood and her family’s fight against environmental injustice. Noah's father, Paine Underwood, is passionate about protecting the ocean and its wildlife, especially concerning a resort owner who is dumping sewage illegally into the water. Throughout the novel, Noah takes a stand to uncover the truth and defend the marine environment they cherish.

As the narrative unfolds, Noah and her family navigate challenges and pursue justice. The story highlights the importance of environmental activism and standing up against wrongdoing. Underwood emphasizes the significance of taking action to protect natural resources, making the story both thrilling and educational for readers.