Elizabeth Hand's darkly sensual debut novel took the science fiction and general reading public by storm and now, seven years later, it is available again in a handsome trade paperback edition. Heralded as a considerable stylistic and imaginative accomplishment, as noteworthy in its way as Margaret Atwood's "The Handmaid's Tale," by People magazine, "Winterlong" explores the disturbing remains of humanity irrevocably altered by genetic engineering run amok.