More Otherdom, this time when Marcia comes out of surgery -- remembering none of her too protected past -- to marry a novelist Louis before her companion, the only one who really ""knew,"" dies. But Louis' mother sees things -- a dark, evil girl, while her unknown father suddenly turns up to threaten her about a twin -- a Siamese twin -- severed in fact if not in spirit. . . . Miss Conway has a readership since she suffuses her stories with romanticism even if this one is really not much more malevolent than Cashmere Bouquet.