Amis' interest in science fiction led to "New Maps of Hell" (1960). It was about how he felt about science fiction in literature. He liked the stories of Frederik Pohl and C.M. Kornbluth. With the Sovietologist Robert Conquest, Amis produced the science fiction series "Spectrum" I–IV. This series got a lot of its ideas from the 1950s magazine "Astounding Science Fiction". He wrote three science fiction novels. "The Alteration" was an alternate history novel set in a twentieth-century Britain. "Russian Hide-and-Seek" was an alternate history where Russia had conquered Britain after the Second World War. He also wrote the supernatural-horror novel "The Green Man" which the BBC adapted for television.