"Then neither of them will suspect that I've been posted," muttered
Benson, with a short laugh.

"Why do you say that?"

"Because I rather think," smiled the young submarine captain, "that I
may attempt to pay that pair back in their own coin--somehow. By the
way, do either of them know you well when they see you?"

"They might remember me as a newspaper writer," replied Graham. "So
I'll keep out of the way."

"It won't be necessary for me to keep out of the way," added Hennessy.
"I don't know either Mlle. Nadiboff or her companion; and, besides, I'm
here openly as a reporter interested in the submarine craft."

By this time the three had returned to the upper air.

"I'll vanish, now," proposed Mr. Graham. "But you, Hennessy, if Captain
Benson doesn't mind, might as well go along with him. You may get a
good look at the Nadiboff woman. You, too, may think her very young.
She has a knack of keeping so. Yet she's at least twenty-eight or
thirty. Good-bye, for the present!"

Graham turned, losing himself from their sight amid the ruins. Hennessy
walked with Jack back to where Hal and the woman awaited them.

Jack's mind was rapidly revolving plans for teaching some one a lesson
that would not be forgotten.