enant Ridder is the one who nabs him," remarked
Hal, coolly. "All that I'm particular about is to see this foreign
agent nabbed before he succeeds in getting any information out of the
country."

The car that bore the boys was soon driving through the streets of
Radford. Jack held in his hand a list of the better grade and
middle-class hotels that Colonel Totten had given him.

"Which hotel are we going to first?" asked Hal.

"I don't know," uttered Jack, suddenly, sharply. "I know what I'm going
to do, however."

Leaning slightly forward the young submarine captain prodded the
chauffeur lightly, twice, in the back--a signal that had been agreed
upon at need.

In response, the chauffeur ran the car slowly in at the curb.

Captain Jack, opening the tonneau door, was quickly out on the sidewalk,
without any need having risen for wholly stopping the car, which then
shot forward again.

"Now, what on earth was that for?" demanded Eph Somers, as the car
sped on.

"Don't look back," replied Hal.

"Why not?"

"Well, a certain party would see you looking at him."

"Who?"

"Why, Jack had the good luck to see Millard going along on the sidewalk.
We've just passed the fellow!"

"Are we going to nab him?" demanded Somers, breathlessly.

"You'll have to leave that decision to good old Jack," chuckled Hal
Hastings. "He's out there, dogging Millard from the rear. It's Jack
Benson's affair just at this moment."

It was mighty hard for Eph to refrain from looking back. But he
restrained his curiosity.

CHAPTER VI

FLANK MOVEMENT AND REAR ATTACK

When Jack Benson first touched the sidewalk, and the automobile glided
on, leaving him in the wake of Millard, it was the young submarine
captain's intention to follow his instructions to the letter.

Millard, having no especial reason of his own for feeling in danger, was
walking along at a moderate gait, occasionally glancing into shop
windows or gazing at the people whom he passed.

He did not look behind, so it was easy for Jack, less than half a block
to the rear, and keeping close to the buildings, to follow without being
detected.

"Hullo," muttered the submarine boy. "There's a policeman on the
crossing at the next corner. In another moment our long-legged one will
be safely in custody."

Feeling in his inner coat pocket for the written authorization, Benson's
fingers touched the envelope.

"He's easily caught;" murmured the boy.

There