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

"We're early," said Beth, as they came to the edge of the woods and sighted the farm house; "but that is better than being late."

Then she stopped suddenly with a low cry and pointed to the right wing, which directly faced them. Bob West turned the corner of the house, tried the door of Uncle John's room, and then walked to one of the French windows. The sash was not fastened, so he deliberately opened it and stepped inside.