As Helen returned to the garden again, Ridley's words of warning came into her head, and she hesitated a moment and looked at Rachel sitting between Hirst and Hewet. But she could draw no conclusions, for Hewet was still reading Gibbon aloud, and Rachel, for all the expression she had, might have been a shell, and his words water rubbing against her ears, as water rubs a shell on the edge of a rock.