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Yet here was the one great question, Whence had come the impulse that had sent the famous Z99 to her fate?

“Could it have been through something internal?’ I asked. “Could a current from one of the batteries have influenced the receiving apparatus?”

“No,” replied the captain mechanically. “I have a secret method of protecting my receiving instruments from such impulses within the hull.”

Kennedy was sitting silently in the corner, oblivious to us up to this point.

“But not to impulses from outside the hull,” he broke in.

Unobserved, he had been bending over one of the little instruments which had kept us up all night and bad cost a tedious trip to New York and back.

“What’s that?” I asked.

“This? This is a little instrument known as the audion, a wireless electric-wave detector.”

“Outside the hull?” repeated Shirley, still dazed.

“Yes,” cried Kennedy excitedly. “I got my first clue from that flickering Welsbach mantle last night. Of course it flickered from the wireless we were using, but it kept on. You know in the gas- mantle there is matter in a most mobile and tenuous state, very sensitive to heat and sound vibrations.

“Now, the audion, as you see, consists of two platinum wings, parallel to the plane of a bowed filament of an incandescent light in a vacuum. It was invented by Dr. Lee DeForest to detect wireless. When the light is turned on and the little tantalum filament glows, it is ready for business.

“It can be used for all systems of wireless–singing spark, quenched spark, arc sets, telephone sets; in fact, it will detect a wireless wave from whatever source it is sent. It is so susceptible that a man with one attached to an ordinary steel-rod umbrella on a rainy night can pick up wireless messages that are being transmitted within some hundreds of miles radius.”

The audion buzzed.

“There–see? Our wireless is not working. But with the audion you can see that some wireless is, and a fairly near and powerful source it is, too.”

Kennedy was absorbed in watching the audion.

Suddenly he turned and faced us. He had evidently reached a conclusion. “Captain,” he cried, “can you send a wireless message? Yes? Well, this is to Burke. He is over there back of the hotel on the hill with some of his men. He has one there who understands wireless, and to whom I have given another audion. Quick, before this other wireless cuts in on us again. I want others to get the message as well as Burke. Send this: ‘Have your men watch the railroad station and every road to it. Surround the Stamford cottage. There is some wireless interference from that direction.'”

As Shirley, with a half-insane light in his eyes, flashed the message mechanically through space, Craig rose and signalled to the house. Under the portecochere I saw a waiting automobile, which an instant later tore up the broken-stone path and whirled around almost on two wheels near the edge of the cliff. Glowing with health and excitement, Gladys Shirley was at the wheel herself. In spite of the tenseness of the situation, I could not help stopping to admire the change in the graceful, girlish figure of the night before, which was now all lithe energy and alertness in her eager devotion to carrying out the minutest detail of Kennedy’s plan to aid her father.

“Excellent, Miss Shirley,” exclaimed Kennedy, “but when I asked Burke to have you keep a car in readiness, I had no idea you would drive it yourself.”

“I like it,” she remonstrated, as he offered to take the wheel. “Please–please–let me drive. I shall go crazy if I’m not doing something. I saw the Z99 go down. What was it? Who–“

“Captain,” called Craig. “Quick–into the car. We must hurry. To the Stamford house, Miss Shirley. No one can get away from it before we arrive. It is surrounded.”

Everything was quiet, apparently, about the house as our wild ride around the edge of the harbour ended under the deft guidance of Gladys Shirley. Here and there, behind a hedge or tree, I could see a lurking secret-service man. Burke joined us from behind a barn next door.