"It was Ben O'Gard!" Victor Vail put in, his voice thick with emotion. "Oh, Mr. Savage, I was so mistaken about that man! I thought he was my friend. I had every confidence in the world in him. When he called me here

"So it was Ben O'Gard who telephoned you!" Monk interposed.

At the sound of Monk's mild voice, Victor Vail registered great remorse. Obviously, he was terribly sorry for that crack he had taken at Monk's head with the paper weight.

"I do not know how I shall ever redeem myself for my horrible mistake," choked the blind man. "Ben O'Gard told me an awful story of how you men were holding me here to keep me from seeing him. I believed O'Gard. I know I was a fool to do that now, but at the time, I regarded O'Gard as a friend who had twice saved my life. He told me to escape and come to him. That is why I struck you."

"Forget it!" chuckled Monk.

Renny spoke up. "What baffles me is why Ben O'Gard took over the dentist's office."

Doc's strong lips warped their faint smile.

"Simple," he said. "Ben O'Gard wanted to use the dentist's X ray!"

THIS STATMENT elicited surprised looks from every one present.

"X ray!" Renny grunted. "Why'd they want the X ray?"

"I'll show you the reason in a minute," Doc replied. "First, though, I want to find out what Ham learned about the liner Oceanic."

Ham now divulged the information which several transatlantic telephone calls to England had gathered.

"On the English records, the liner Oceanic is down as lost at sea-sunken without trace," Ham said. "There's no hint of this stuff about it being trapped in the polar ice pack."

"I'm not surprised," Doc Savage said dryly.

"I've got something that will surprise you," Ham smiled. "There was fifty million dollars in gold bullion and diamonds on the Oceanic!"

An electric shock seemed to sweep the room.

"Fifty million! Will you say that again!" Monk said mildly.

"Fifty million in gold and sparklers," repeated Ham impressively.

"That explains it!" Doc declared.

"Explains what?" Renny wanted to know.

"What's behind this whole mess," retorted Doc. "Come into the laboratory. I want to show you something, brothers."

It was an excited crowd of adventurers which surged into the vast laboratory room.

From a tray. Doc lifted several large photographic prints. These were X ray pictures which he had taken of Victor Vail in his course of examining the violinist to determine his eve affliction. Until now, Doc had not had time to as much as examine the prints.

He held one up.

"Holy cow!" barked Renny.

"Exactly," Doc agreed. "More than fifteen years ago, while Victor Vail was under the influence of an anaesthetic, some one tattooed a map on his back with a chemical, the presence of which could only be detected by use of a certain tensity of X ray."

"You mean I have carried the map on my back these many years without knowing it?" Victor Vail questioned wonderingly.

"You certainly have. You recall the man with the clicking teeth who seemed to haunt your trail through the years? Well, he was simply keeping track of you and the map."

"But what is the map?"

"It shows where the liner Oceanic is aground on a land far within the arctic regions," Doc announced.

SOME MINUTES were expended examining the chart.

"But I cannot understand why I carried the map around unmolested for so many years!" Victor Vail murmured.

"Possibly I can reconstruct a story which explains that," Doc told him. "The fifty millions in treasure aboard the Oceanic led Ben O'Gard, Keelhaul de Rosa, and the other members of the crew to mutiny. They probably disposed of all who did not join them!"

"The beasts!" Victor Vail covered his face with his hands. "My poor wife. My poor little daughter, Roxey! That devil, Ben O'Gard, murdered them! And I thought he was my friend!"

"It's merely guesswork about the murder part!" Doc put in hastily. "I said that simply because the eagerness of Ben O'Gard and Keelhaul de Rosa to get this map shows they think the Oceanic is where they left it, even now. This indicates there were no survivors but themselves."

Victor Vail recovered his control. '"When Keelhaul de Rosa tried to kidnap me from Ben O'Gard, he was really trying to steal the treasure map!"

"Of course," Doc agreed. "That explains why the two factions split. No doubt they have been waging unremitting war with each other since that day, each faction trying to slay the other so they would be free to secure the chart off your back, and go get the fifty millions."

"I'm surprised they left it behind in the first place!" Monk put in.

"We barely escaped with our lives as it was," Victor Vail assured him. "To carry more than food over the ice pack was impossible."

Ham made a quick gesture with his sword cane — and Monk ducked involuntarily.

"Both Ben O'Gard and Keelhaul de Rosa now have copies of this map," Ham said thoughtfully.

Doc Savage let his strange golden eyes rest on each of his friends in turn. The gilded orbs seemed to be asking a question — and receiving a highly satisfying answer.

"Brothers," Doc said softly, "these birds who are after that treasure are fellows who have no right to any man's gold. What say we get it ahead of them? We can use the money to enlarge our secret institution in upstate New York to which we send criminals to be made into useful citizens. The place is becoming a little crowded."

Pandemonium seized Doc's headquarters.

Renny swung over to the door. His enormous fist struck. The panel flew out of the door as though hit by a cannonball. No door was safe around Renny when he was happy.

Monk fled wildly about the place, each apelike leap barely taking him out of reach of the lusty whacks delivered by the pursuing Ham's sword cane.

Long Tom and Johnny got into a mock fight and promptly upset a stand of apparatus. In the ensuing crash, several hundred dollars' worth of equipment was ruined.

The horseplay was their way of saying they thought Doc's treasure-hunt scheme was the best idea they'd heard recently.

BEFORE THAT day was done, Doc Savage had operated on Victor Vail's eyes.

He performed the delicate bit of surgery in New York's finest hospital. Those who surrounded him as he worked were not ordinary nurses. They were some of the leading American eye specialists. One had flown from Boston to see the operation, another from Detroit, and two from Baltimore.

They wanted to see this epochal piece of work, for Doc Savage was seeking to do something which every expert present had until this very day maintained was impossible.

And what the assembled specialists saw the mighty bronze man do that day in the New York hospital operating room was something they would talk about for a long time to come. The mastery of it held them breathless long after big Doc Savage had taken his departure.

Victor Vail would have his sight back!

THE NEXT morning, as Ham entered Doc's office, Doc was taking his exercises.

Ham sat down to wait. Doc took his exercises — a terrific two-hour routine each day of his life, and nothing interfered.

Doc's ritual was similar to ordinary setting-up movements, but infinitely harder, more violent. He took them without the usual exercising apparatus. For instance, he would make certain muscles attempt to lift his arm, while other muscles strove to hold it down. That way he furthered not only muscular tissue, but control over individual muscles as well. Every ligament in his great, bronzed body he exercised in this fashion.