Spellbinders by Margaret Culkin Banning

Margaret knew all about it now. From her point of view certain conventions of non-interference between husband and wife were so many links in the old chain. Undoubtedly it was not that she wanted to force Helen's confidence. But to come upon Helen the Monday after that exhausting Sunday, come to her to say good-by and make plans for the future, and to find the splendid dignity and poise of the Helen she had been with in Chicago destroyed angered her. Helen had told her the facts. She had to tell some one, she told herself in a justification she felt bound to make in secret, and Margaret was at least a stranger in the city and moreover the only woman she knew who would not make the slightest impulse to carry her story to other ears.

Margaret, in immaculate white linen, looking as cool and competent as an operating surgeon, had listened. She heard the whole of the story, how Gage had changed -- for that Helen insisted upon.