Question: Showboat World, written in 1975, is the second, stand-alone novel in a pair of science fiction novels by Jack Vance, was an American mystery, fantasy, and science fiction writer, he also wrote how many mystery novels, under the pseudonym Ellery Queen?
Sentence (from "Showboat World"): Showboat World (original title: The Magnificent Showboats of the Lower Vissel River, Lune XXIII, Big Planet), written in 1975, is the second, stand-alone novel in a pair of science fiction novels by Jack Vance (the first being "Big Planet") that share the same setting, a backward, lawless, metal-poor world called Big Planet.
Relevant evidence: Yes