“Somebody’s dropped a billet-doux,” said Helen. “Or is it just an envelope?”
Ruth picked it up and turned it over so that she could see its face. “The letter is in it,” she said. “And it’s been opened. Why, Helen!”
“Yes?”
“It’s for Edie Phelps.”
Helen had already glanced upward. “And right under our windows,” she murmured. “I bet she dropped it when——”
“I suppose she did,” said Ruth, as her chum’s voice trailed off into silence. Suddenly Helen, who was looking at the face of the envelope, gasped.
“Look!” she exclaimed. “See the return address in the corner?”
“Wha——Why, it says: ‘Box 24, R. F. D., Yucca, Arizona!’”
“Yucca, Arizona,” repeated Helen. “Just where we are going. Ruth! there is something very mysterious about this. Do you realize it?”
“It is the oddest thing!” exclaimed Ruth.