"Yes, go on," urged Foster.
"That messages to the German cruisers were being relayed from stations close together; in other words, that the station in the heart of this city had a wave length shorter than Arlington's minimum wave length, and the Arlington Radio Station was unable to hear—you already know that a transmitting and receiving station can only hear each other when in tune; that is, the wave length of each must be equal. I therefore established a receiving station in my room with a short wave length—and the result justified my reasoning."
"Good!" ejaculated Foster heartily.
"But at that, while I had the messages to turn over to Chief Connor, I was still in the dark as to the location of the sender. You know it is impossible to determine the direction or distance of a transmitting station by its waves—a ship at sea cannot be found by wireless unless its bearings are given. I concluded that the transmitting station must be in the vicinity of the government buildings, and the next relay within five miles—a greater wave length could be picked up by Arlington.
"On Tuesday night I got on the roof of one of the tall government buildings near here, and examining each roof as I crossed it looking for wireless antennae, I finally reached this house. I suspected I was being watched by Baron von Fincke, but managed to confuse him as to the direction I was taking, and finally clambered down into this attic through the scuttle. I was certain he was not aware of my identity, and for the sake of my plans, could not risk discovery.
"I had never been in your attic before," went on Miller, addressing Kathleen directly. "I was not even positive this was your house. When trying to find my way about I chanced upon the elevator shaft; I thought I was walking into a closet. At that moment I heard a footstep on the stair." Julie started and bent eagerly forward. "Desiring to get away as quickly as possible, I pressed the button for the elevator…."
"But the elevator must have been right there," interrupted Kathleen.
"You could not have opened the outer mahogany door otherwise."
"So I realized when I had collected my wits," responded Miller. "Opening both doors, I bolted into the elevator a few minutes before the footsteps reached the attic."
"Was Spencer in the elevator then?" questioned Foster.
"I don't know; the elevator was dark, and I only used my flashlight for a second to show me the proper button to push for the first floor. It may be that Spencer was in the elevator, but I did not see him."