"Nothing," Penny answered shortly. If Amy did not feel like explaining, she could not bring herself to ask.
In silence the girls continued their packing Presently Amy picked up the letter and thrust it into her pocketbook.
"I guess I'm ready," she announced.
They each took a bag and started down the stairway. But as they reached the lower landing, Penny abruptly halted, warning her companion to keep back.
"What is it?" Amy whispered.
Penny indicated a man who was standing on the opposite side of the street, loitering in the doorway of a bakery shop.
"A detective from police headquarters! I've seen him at the station."
Hastily the girls retreated back up the stairs to the bedroom. Amy flung herself into a chair.
"It's useless trying to escape," she murmured. "I may as well give myself up."
Penny went to the window and looked out. The bedroom opened over an alley and she was elated to see that it had a fire escape. No one was in sight.