Doris Lessing was one of the most impressive, prolific and vital of twentieth century writers. Her fiction is obsessed with the workings of cultural change and she radically extended the novel's scope - most famously and influentially in The Golden Notebook - by questioning the realist tradition she inherited and the wider social beliefs about self, sexuality and authority which that tradition symbolized. This study, originally published in 1983, surveys her epic output from her early, African writings to her later experiments with space fiction. It traces her struggles to decentre imaginative life and to erase and to redraw the boundaries of our mental maps in favour of values on the margins of the official culture.