Marion Zimmer Bradley was an American author and feminist activist born in 1930 in Albany, New York. She is best known for her work in the science fiction and fantasy genres, including the Darkover series, which she began writing in the 1950s.

One of Bradley's lesser-known works is the novel "The Door Through Space," which was first published in 1961. The novel is a classic space adventure story that follows the exploits of a mercenary named Richard Ashe, who is hired to investigate the disappearance of a spaceship.

Ashe is sent to the planet Wolf, where he discovers a mysterious gateway known as the "Door through Space." The Door is said to lead to a mythical world known as the "Forbidden Planet," where ancient and powerful aliens are said to reside. Ashe must navigate treacherous alien terrain, outwit dangerous adversaries, and confront his own demons in order to unravel the mystery of the Door and the secrets it holds.

One of the most interesting aspects of "The Door Through Space" is its portrayal of gender roles and power dynamics. Bradley was a vocal feminist and many of her works explore themes of gender equality and social justice. In "The Door Through Space," the powerful aliens who control the Door are all women, who use their telepathic powers to control and manipulate the men around them.

Ashe himself is a complex character, who is torn between his loyalty to his male employers and his growing admiration for the powerful women he encounters on his journey. The novel also features several strong female characters, including Kyla, a fierce warrior who becomes Ashe's ally, and Zulena, the powerful alien queen who holds the key to the Door's secrets.

Overall, "The Door Through Space" is a thrilling and thought-provoking work of science fiction that showcases Marion Zimmer Bradley's talent for world-building and character development.