Aunt Jane's Nieces at Millville by L. Frank Baum

Ethel came frequently to visit the girls at the Wegg farm, and at such times Uncle John treated her with the same affectionate consideration he bestowed upon his nieces, and made her so cordially welcome that the little school teacher felt entirely at her ease. The girls did not confide to Ethel their investigation of the Wegg mystery, but in all other matters gave her their full confidence. Together they made excursions to the Falls, to the natural caves on the rocky hill called Mount Parnassus, or rowed on the lake, or walked or drove, as the mood seized them. But mostly they loved the shade of the pines and the broad green beside the quaint mansion Captain Wegg had built, and which now contained all the elements of a modern summer home.

Once Louise asked Ethel, casually, if she knew what "great trouble" had come to Hucks and his wife in their early life, but the girl frankly answered that the old people had never referred to anything of the kind in her presence.