The Ace Double 12140 is a science fiction novel published by Ace Books in 1969. The book features two stories by authors Kenneth Bulmer and Brian M. Stableford, with the titles "Cradle of the Sun" and "Wizards of Senchuria". The novel is part of the Ace Doubles series, known for featuring double the fiction content in a single paperback edition. With an English language publication and a focus on science fiction, this novel offers readers a unique and immersive storytelling experience.