Another Heaven, Another Earth ( 1981) intriguingly presents a complex vision of human limitations on a colony planet which is demonstrably inimical to life (see Colonization of Other Worlds). The two young protagonists of This Time of Darkness ( 1980), a tale for younger children, experience a Conceptual Breakthrough, which takes the narrative form of a heuristic set of ramps leading upwards, enabling them to transcend the bleak Underground Pocket-Universe society in which they had been raised.

The habitat where Away Is a Strange Place to Be ( 1990) take place is more Dystopian. Return to Earth ( 1980), set a millennium hence in a vast Space Habitat and on Earth, humanizes a thriller plot through its close portrayal of a growing friendship between an old man and a young girl – friendship between generations being unusually evident in Hoover's work. The protagonist of The Rains of Eridan ( 1978), set on an Alien world where scientific stations are assaulted by waves of seemingly unnatural fear, uncovers the mystery without betraying the methods and goals of science. Hoover soon showed her competence with a wide range of venues and themes, though she retained an emphasis (perhaps surprising, but challenging) on the Dystopia and on various kinds of Ruined Earth: The Delikon ( 1977), for instance, investigates a political revolution against an Alien occupier of Earth, which has been treated as roughly as its Imperialist citizenry had been treating the natives of other planets. The first of these were Children of Morrow ( 1973) and its sequel, Treasures of Morrow ( 1976), a Ruined Earth sequence which, in describing a reactionary state and its pro- Technology successor, plumps cautiously for the latter the books demonstrate a smoothly searching style and a grasp of character. Whole Truth-and Other Myths: retelling Ancient Tales, with commentaries by Carla McK.(1935-2018) US author, all of whose novels of sf interest have been written for the Young Adult market or as Children's SF for younger readers.

The Dawn Palace: The Story of Medea (1988).The Shepherd Moon: a novel of the future (1984).

Return to Earth: a novel of the future (1980).The Lion's Cub (1974) – historical novel set in the court of Nicholas I of Russia, LCCN 74-8594.She died of cancer, aged 83, in Locust Grove, Virginia, on August 22, 2018. Her 1996 novel The Winds of Mars tied for the Golden Duck Awards' Hal Clement division for young adult literature. Most of her science fiction is for older children and often features friendships between those of different generations. Helen Mary Hoover (Ap– August 22, 2018) was an American children's writer.

Orvis by Helen Mary Hoover