"What makes you think so?" Amy inquired skeptically.
"Ever since we left the park a man has been trailing us."
"Are you sure?"
"Every time we stop he does too. I can see his reflection now in the plate glass. He's pretending to be looking into that jewelry store window but he's really watching us."
"You mean the man in the gray topcoat?"
"Yes."
"Maybe he's a plain-clothes man who is after me," Amy said uneasily.
"We can soon find out. Come on!"
Catching Amy's arm, Penny steered her into the department store. They sauntered leisurely through the aisles, frequently pausing to examine merchandise. Unobtrusively, they kept watch of the main entrance.
"Here he comes, just as I knew he would!" Penny exclaimed in an undertone as she caught a glimpse of the man entering the store. "We must shake him quickly now."