Not wishing to even see him again that evening, she arose and explored the veranda. It was crowded so she came indoors again and wandered through the rooms adjoining the reception hall. The library was entirely deserted.
Penny peered with interest at the books which lined the wall cases. Most of them did not appear to have ever been used. Selecting one at random she curled herself comfortably in an upholstered chair, sitting with her back to the door.
"I'll just stay in here for an hour or so and read," she decided. "No one will miss me."
The book was interesting and when Penny glanced at the little clock on the table she was surprised to see that it was nearly eleven o'clock.
"Dad should be coming along soon," she told herself. "He'll be wondering what became of me."
Reluctantly she closed the book. Before she could leave her chair to put it away she heard voices just outside the library door.
Mrs. Dillon and a feminine guest entered the room. They were talking in low tones.
"I haven't told a soul except you," Mrs. Dillon declared. "Before I show you my treasure, you must promise never to reveal my secret. I shouldn't care to be arrested."
"Of course I promise," the other agreed.
Neither of the women was aware of Penny's presence in the library for she was concealed behind the high back of the chair. The girl hesitated to reveal herself, for already she had heard enough to cause Mrs. Dillon embarrassment. She decided to remain where she was and keep quiet.