not publish Stranger in a Strange Land until some time after it was written, and the themes of free love and radical individualism are prominently featured in his long-unpublished first novel, For Us, the Living: A Comedy of Customs. The Moon Is a Harsh Mistress tells of a war of independence waged by the Lunar penal colonies, with significant comments from a major character, Professor La Paz, regarding the threat posed by government to individual freedom. Although Heinlein had previously written a few short stories in the fantasy genre, during this period he wrote his first fantasy novel, Glory Road. In Stranger in a Strange Land and I Will Fear No Evil, he began to mix hard science with fantasy, mysticism, and satire of organized religion. Critics William H. Patterson, Jr., and Andrew Thornton believe that this is simply an expression of Heinlein's longstanding philosophical opposition to positivism. Heinlein stated that he was influenced by James Branch Cabell in taking this new literary direction. The penultimate novel of this period, I Will Fear No Evil, is according to critic James Gifford "almost universally regarded as a literary failure" and he attributes its shortcomings to Heinlein's near-death from peritonitis. Later work, 1980–1987 After a seven-year hiatus brought on by poor health, Heinlein produced five new novels in the period from 1980 (The Number of the Beast) to 1987 (To Sail Beyond the Sunset). These books have a thread of common characters and time and place. They most explicitly communicated Heinlein's philosophies and beliefs, and many long, didactic passages of dialog and exposition deal with government, sex, and religion. These novels are controversial among his readers and one critic, David Langford, has written about them very negatively. Heinlein's four Hugo awards were all for books written before this period. Most of the novels from this period are recognized by critics as forming an offshoot from the Future History series and are referred to by the term World as Myth. The tendency toward authorial self-reference begun in Stranger in a Strange Land and Time Enough for Love becomes even more evident in novels such as The Cat Who Walks Through Walls, whose first-person protagonist is a disabled military veteran who becomes a writer, and finds love with a female character. The 1982 novel Friday, a more conventional adventure story (borrowing a character and backstory from the earlier short story Gulf, also containing suggestions