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.