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Non-Stop by Brian W. Aldiss is $1.99 at Amazon US.

Non-Stop is Grand Master of Science Fiction and Hugo and Nebula Award–winning author Brian W. Aldiss’s debut novel. Written in response to Robert Heinlein’s Orphans of the Sky and published in the late 1950s, it is set in a primitive world, home to tribes of inhabitants who endure their harsh and stunted lives in a maze of corridors. Though legends exist that they’re actually on a ship traveling through the universe, no one really believes it. But that conviction doesn’t stop a group of people from embarking on a mission to find the rumored “Forwards” section and its control room. Through a tangled, hydroponic jungle, they’ll encounter telepathic animals, giants, outcasts, and mutants in an epic race to uncover the truth—and survive . . .