Two days later the monotony of the voyage, which was broken only by the radiograms which were posted daily concerning the race between the American and British liners—the Columbia being in the lead—was rudely shattered by an incident in which Jack was destined to play an important part. Jack had been on a visit to Raynor during the young engineer's night watch in the engine-room. They had stayed chatting and talking over old times till Jack suddenly realized that it was long after midnight and time for him to be in his bunk.

Hastily saying good-night, he made his way through the deserted corridors of the great ship, which stretched empty and dimly lit before him. As he traversed them the young wireless man could not but think of the contrast to the busy life of the day when stewards swarmed and passengers hurried to and fro. Now everything was silent and deserted, except for the still figures up on the bridge and below in the engine and fire rooms, guiding and powering the great vessel onward through the night at a twenty-four-knot clip.

The lad had just reached the end of one corridor, and was about to turn into another which led to a companionway, which would bring him to his own domain, when he stopped short, startled by the sound of a single sharp outcry. It came from the corridor he was about to turn into. Jack darted round the corner and almost instantly stumbled over the huddled body of a man lying outside one of the cabin doors.

A dark stain was under his head, and Jack saw at once that the man had been the victim of an attack. At almost the same moment, by the dim light, he recognized the unconscious form as being that of Joseph Rosenstein, a diamond merchant, so wealthy and famous that he had been pointed out to Jack by the purser as a celebrity.

"Queer fellow," the purser had said. "Won't put his jewels in the safe, although I understand he is carrying three magnificent diamonds with him. Likely to get into trouble if anyone on board knows about it."

"He's taking big chances," agreed Jack, and now here was the proof of his words lying at the boy's feet. Suddenly he recalled having received a message a few days before from New York for the injured man.

"Be very careful. F. is on board," it had read, and Jack interpreted this to be meant as a warning to the diamond merchant. But he did not devote much attention to it just then, except to rouse the sleepy stewards. Within a few minutes the captain and the doctor were on the scene.

"A nasty cut, done with a blackjack or a club," opined Dr. Browning, as he raised the man.

"Is it a mortal wound?" asked the captain. "This is a terrible thing to have happen on my ship."

"I think he'll pull through if no complications set in," said the doctor, and ordered the man removed to his cabin. Suddenly Jack recollected what the purser had said about the diamonds.