"Well, here we go again! Never a dull moment with Nancy around!" George laughed gaily.

"Don't be too impatient, George," Nancy advised with a grin. "We don't have proof that any of today's incidents is really cause for suspicion."

At this moment a foreign-make car went by. Nancy glanced casually at the driver, then gave a start. He was the man who had spoken to her on the train!

He slowed down and stared at the three girls and at the Fayne home. Nancy felt at once that he was memorizing the address. He gave a self-satisfied smile and drove on. Nancy noted his license number.

"I almost feel as if I'll hear from him again," she told herself, then revealed to the girls, who had not noticed the car's driver, that he was the man who had confronted her on the train.

"He's still interested in you," Bess teased.

But George found nothing to laugh about. "I don't like this. Nancy," she said seriously. "I remember he had a hard, calculating face."

Nancy, too, remained serious. A disturbing thought had suddenly occurred to her.

"Why," she told herself, "that man must have been trailing me. But I wonder for what reason?" She determined, for the moment at least, not to mention her suspicions aloud and dropped the subject of the mysterious man. Presently she bade Bess and George good-by, climbed into her convertible, and drove home.

"I think I'll ask Dad what he thinks about that man Al's mysterious telephone message," Nancy decided as she hopped from the car.

She had often taken some of her puzzling problems to her father. He, in turn, frequently discussed his law cases with his daughter and found Nancy's suggestions practical.

"You look tired, dear," Carson Drew observed as she entered the living room and sank into a comfortable chair. "Have a big day shopping?"

"I can't remember when so much ever happened to me in one day." Nancy smiled despite her fatigue.