The woman made no response.
"You will do that?" Penny asked.
"Yes," Mrs. Dillon answered harshly.
"I'll see you again tomorrow," Penny said, arising to depart. "Until then you have my promise that I will not talk with the police."
"I have nothing to fear from them," Mrs. Dillon announced proudly.
"Not if you show a willingness to cooperate," Penny agreed. "When you think the matter over, I believe you will decide to reveal the name of your friend—the agent who negotiated the sale."
She waited an instant, hoping that Mrs. Dillon would reconsider. When the woman did not speak, she turned and walked from the living room, letting herself out the front door.
Emerging upon the street, Penny's first thought was to find a good hiding place where she could wait to view Mrs. Dillon's expected caller.
"I may have a tedious time of it," she reflected, "but if I learn the identity of the agent with whom she dealt it will be worth all the trouble."
A half block away she noticed a large truck parked along the curbing. The vehicle had been abandoned, a cracked-up front wheel giving mute evidence that it had been in an accident. The truck was of the closed cab type and it dawned upon Penny that if she could get inside, she would have a perfect observation post.