"Knuckle Sandwich" is the gangster-chic book by Dermot "Duster" Hoggins, published by Timothy Cavendish's
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"Knuckle Sandwich" as it appears in the film.

vanity press. The book describes the author's rough and tumble escapades and those of his thug-like friends and family. "Knuckle Sandwich" becomes a overnight surprise success when the author suddenly flings book critic Felix Finch from a twelfth floor balcony. The movie rights to "Knuckle Sandwich" are eventually sold to a movie studio and there is enough money from its sale for everyone, including the Hoggins nephews - satisfying them enough to leave Cavandish alone.
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