The stanza of which it is a part, quoted by a character in the novel, is as follows: ... my purpose holds To sail beyond the sunset, and the baths Of all the western stars, until I die.

It is the final part of the "Lazarus Long" cycle of stories, involving time travel, parallel dimensions, free love, voluntary incest, and a concept that Heinlein named pantheistic solipsism, or 'World as Myth': the theory that universes are created by the act of imagining them, so that somewhere (for example) the Land of Oz is real.

Other books in the cycle include Methuselah's Children, Time Enough for Love, The Number of the Beast, and The Cat Who Walks Through Walls.

In addition, Maureen lives through, and gives her (sometimes contradictory) viewpoints on many events in other Heinlein stories, most notably the 1917 visit from the future by "Ted Bronson" (Lazarus Long), told from Long's point of view in Time Enough for Love, D. D. Harriman's space program from The Man Who Sold the Moon, and the rolling roads from The Roads Must Roll.

She is eventually rescued from prison by Lazarus Long and other characters of various novels in the ship Gay Deceiver (from The Number of the Beast), and after rescuing her father from certain death in the Battle of Britain, is united with her descendants in a massive group marriage in the settlement of Boondock, on the planet Tertius.