Four women living on parallel Earths—each with a different landscape of gender roles—have a chance to travel to each other's worlds. Jeannine, Joanna, Janet, and Jael all find their ideas about what it means to be a woman are challenged, and when they return home, their perspectives have changed. A pioneering author in feminist science fiction, Johanna Russ is best known for this 1970 novel; finally published in 1975 and nominated for a Nebula Award, it later won a retrospective Tiptree Award.