"I came to see you," replied the man. "May I have a talk with you privately?"
"I—I suppose so," assented Mr. Swift nervously. "Come into the house."
Mr. Berg left Tom's side and advanced to where Mr. Swift was standing. Together the two emerged from the now fast darkening shop and went toward the house.
"Who is he?" asked Mr. Sharp of the young inventor in a whisper.
"I don't know," replied the lad; "but, whoever he is, dad seems afraid of him. I'm going to keep my eyes open."
Chapter Three
Mr. Berg is Astonished
Following his father and the stranger whom the aged inventor had addressed as Mr. Berg, Tom and Mr. Sharp entered the house, the lad having first made sure that Garret Jackson was on guard in the shop that contained the submarine.
"Now," said Mr. Swift to the newcomer, "I am at your service. What is it you wish?"