The Margarets by Sheri S Tepper. H/C. 508 pp.

Margaret Bain is the only child on Phobos, part of a human colony trying to transform Mars into a garden planet. She invents alternative lives for herself ... later all these imaginary Margarets, scattered throughout the universe, have to return home, for the survival of the human race depends on them, all of them.

Published 2008 by Gollancz, London. Condition of dust jacket and pages: Excellent, as new.