This historical mystery centers around the discovery of a tunnel from riverside to a house at Slipper Point, a tunnel used by abolitionists to help fugitive slaves travelling on the Underground Railroad.
speak of it, Sally remarked:
"That's Huckleberry Heights, - at least I've named it that, 'cause Genevieve and I have picked quarts and quarts of huckleberries there. She pointed to a high, sandy bluff, overgrown at the top with scrub-oak, stunted pines and huckleberry bushes. "And that's Cranberry Creek," she went on, indicating a winding stream that emptied into the river nearby. "'Way up that creek there's an old, deserted mill that's all falling to pieces. It's kind of interesting. Want to go sometime?"
"Oh, I'm crazy to!" cried Doris. "There's nothing I enjoy more than exploring things, and I've never had the chance to before. We 've always gone to such fashionable places where everything's just spic and span and cut and dried, and nothing to do but what every one else does. I'm deathly sick of that sort of thing. Our doctor recommended Mother to come to this place because the sea and pine air would be so good for her. But he said it was wild, and different from the usual summer places, and