Dan Fernald, believing that a detective who knew his business would not make a single movement without a certain attendant mystery, had decided it was not safe for him to leave New York in the daytime, and therefore Plums's time of waiting was exceedingly long.

Not until eight o'clock did Dan appear; and then, instead of answering his friend's hail, he marched gravely out through the gate, crossed the street, and, during several seconds, stood peering first to the right and then the left, while from the opposite side Plums looked at him in bewilderment.

Master Plummer had spoken to his friend, but received no reply; had followed a certain distance without being apparently recognised, and stopped in bewilderment when Dan indulged in these curious antics.

Finally the fat boy grew impatient, and, crossing the street, asked, sharply:

"What's the matter with you, anyhow, Dan?"

Master Fernald glanced at his friend only sufficiently long to wink in a most mysterious fashion, and then, turning quickly around, marched gravely up the street without speaking.

Plums watched in anxiety until, seeing his friend dart into a doorway, it suddenly dawned upon him that Dan was desirous of avoiding a too public interview.

Then Plums hastened after him, muttering to himself:

"That feller thinks he's awful smart, scrimpin' an' scrapin' 'round here as if there was a dozen perlicemen right on his track. If he'd go on about his business nobody'd notice him; but when he's kitin' 'round in this fashion folks are bound to wonder what's the matter."

On arriving at the doorway, he looked in, but without seeing any one, because of the gloom.