Search - Two Thousand Pound Goldfish

From the back of book:

What lives in the sewer beneath the city, weighs two thousand pounds, and is coming out tonight to get you?

Warren wants to make horror movies. He's been writing one in his head about a gigantic fish that terrorizes the sewers of a big city. Everyone will love the movie. He'll be famous. He'll have everything. Except his mother.

Warren's mother is wanted by the FBI. And when he finds out that his sister Wizzie has been speaking to her secretly, he's furious. He hasn't spoken to her for years, not since she went into hiding. All he has are some postcards, and the absolute belief that if he could speak to her, she'd come home.

Wizzie and his grandmother say he doesn't understand--the truth is not what he thinks. But Warren knows they're wrong...if only he could prove it!