The jailer turned to reach for a memorandum book.

"I keep the names given by all who come here to see prisoners, so I shall be able to answer you."

"Ah, here are the names. One fellow called himself Leroux, the other
Stephanoulis."

"One name French, and the other Greek," muttered the submarine boy, thinking hard. "What did they look like?"

The jailer quickly and carefully described the pair. Jack listened attentively. Then rose, briskly.

"Did you hear any of the conversation they had with Gaston?"

"No."

"If they come again to-day can you lock them up and hold them?"

"If I have proper authority."

"If you get a telephone message from Mr. Trotter, would that be good enough authority?"