“Just the same,” persisted Peter, “the Panama built by the Spaniards in the year 1518 is now in ruins, unless it has been restored since the Americans took possession of the Canal Zone. It lies six miles to the northeast of the present city of that name.”

“I wish Frank would drop in to-night,” the lieutenant said, after a pause. “I have an idea that he might suggest something of value just now, some way in which his father may be reached. We are leaving for the Zone on Thursday morning, so have only one more day in the city, consequently there is no time to lose.”

The boys fairly shrieked their appreciation of the information that they were to depart for the Isthmus so soon, and gathered about Lieutenant Gordon with extended hands.

“But you must understand this,” the lieutenant said, returning the greetings heartily, “you are not supposed to be in my company at all. I may need to talk with some of you, but if I do it will be in a casual manner, just as one tourist might address another. I am traveling alone, understand. I shall stop at the Tivoli, at Ancon, a short distance from Panama, and you will have a cottage in the jungle, near Gatun.”

“And we are to ramble about wherever we like?” asked Harry.

“Wherever you like,” was the reply, “only you must not look me up unless in case of serious trouble. I’ll communicate with you when necessary.”

The boys all agreed to the conditions readily enough; they would have consented to almost any arrangement in order to be taken on the trip. After the details were disposed of, Ned called the lieutenant aside and asked him a most surprising question:

“Are you really thinking of trying to steal those papers?”

“I’ve a great mind to make the attempt,” was the smiling reply. “We need them in our business, and, besides, the government has plenty of men here who may as well be working on this case as any other.”

“This is on the theory that the papers may reveal to you the nature of the plot and the names of the plotters?”