What, Garth questioned, had been left with such care on the sidewalk in front of the corner house? What object, probably similar, had occasioned the search?
When the car was nearly opposite him the man inside tapped on the pane. On a subdued note the chauffeur exclaimed again, then pulled the car to the curb and stopped it.
Once more the well-dressed man left the limousine and crossed the sidewalk. For the second time he bent and placed something carefully on the ground. It lay within Garth's reach, but just outside his line of vision. In fact, Garth could have grasped the other, so close was he; and he could see, in spite of the inefficient light, that he was young and probably good-looking. His inspection, however, was limited, for the other arose, breathing harshly, as if he were labouring under an unfamiliar excitement, and returned to the car.
As the driver set his gears and let the clutch in Garth reached through the areaway railing and fumbled about the sidewalk for the object. His fingers found it—round, flat, hard—not at all puzzling in itself, yet completely unintelligible as a clue to the young man's motive in placing it there. It was a piece of money.
Garth slipped from the areaway. He held his find up to the nearest lamp. The piece of money was a five dollar gold piece. He glanced along the street. The automobile had just swung from sight. He started quickly after it, because it had occurred to him that if such a performance were repeated in Park Avenue, his curiosity would make him stop the machine, would suggest a number of questions to the young man in the fur coat, would seek an explanation of the chauffeur's furtive impatience.
When he turned the corner he was not surprised to find the limousine halted again, to see the young man returning from a third excursion to the house line where, doubtless, he had with an extreme anxiety placed another piece of money.
Garth broke into a run. The chauffeur glanced over his shoulder and muttered quickly to the man, who sprang in. As soon as the door was closed the car started with a speed almost affirmative of flight.
Garth held up his hand with the gold piece and shouted. The car went faster. He hastened to read the license number on its rear. As he wrote it in his pocket book he watched the red of the tail light diminish and disappear.
He walked over and picked up a twenty-five cent piece. Why then had the young man left five dollars around the corner? He stared at the two coins, his bewilderment growing. What could be the explanation of this trail of money, left with a scrupulous care on New York pavements? Of what abnormal diligence could such an eccentricity be an echo? How pronounced was its significance?
Almost certainly another coin lay close to Lexington Avenue where the car had first stopped. It was not probable that a third exhibit would reflect any light on the affair, still he wanted to learn the denomination of that coin, and evidently it was the final goal of his curiosity to-night.