More like Mimsy Were the Borogoves

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Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Adventurous in tone, about space exploration, set in space.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue
The ChrysalidsNovel
John Wyndhamstandalone novel1955
Reflective in tone, about genetic engineering and survival, set in secondary world.
“An early manuscript version was entitled Time for a Change.”
from the catalogue
Starship TroopersNovel
Robert A. Heinleinstandalone novel1959
Military science fiction, about war, set in space and other star systems.
Red PlanetNovel
Robert A. Heinleinstandalone novel1949
Adventurous in tone, about space colonization and aliens, set in mars.
“A boy colonist on Mars takes his bouncing ball Martian pet with him to boarding school, but the new Headmaster is a controlling tyrant.”
from the catalogue
Citizen of the GalaxyNovel
Robert A. Heinleinstandalone novel1957
Space opera, about identity and slavery, set in other star systems.
“On a planet far distant from Earth, a lame beggar buys a young boy slave who has forgotten his origins.”
from the catalogue
A Tale of Time CityNovel
Diana Wynne Jonesstandalone novel1987
Adventurous in tone, about quests, set in otherworld and early 20th century.
“In 1939 an eleven-year-old London girl is kidnapped to Time City, a place existing outside the stream of time and manipulating the history of humanity, where she finds the inhabitants facing their worst hour of crisis.”
from the catalogue