The cabin was well insulated, so Bob and Lieutenant Gibbons could converse in comparative ease.

“What did Edgar have to say?” asked the intelligence officer.

“He’s afraid the gang is trying to get the secret radio information out of the country by using an unlicensed station which has just started broadcasting from somewhere along the east shore of Maryland.”

Lieutenant Gibbons whistled.

“What’s he doing about it?”

“Federal agents are being sent from Baltimore by motor and another plane is to follow us within a few minutes. The Department of Commerce believes the station is near Rubio and they’re trying to gum up the broadcast as much as possible. Oh, it all clicks beautifully. My uncle was taken down the river in a fast boat and landed somewhere near Rubio. He had the paper they desired and now they are trying to send the information someplace in Europe by using this powerful but unlicensed radio.”

“Sounds logical,” agreed the lieutenant. “Looks like we’re going to have some busy hours ahead of us. Made any plans yet?”

Bob shook his head.

“I haven’t thought any beyond getting to Rubio as fast as we can and trying to learn there whether a boat like the one which slipped out of the tidal basin last night has been sighted there.”

“Think we can swing it alone or are you going to wait for the other agents to catch up with us?”