Importance of "Knuckle Sandwich"

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