At last Tom seemed to comprehend his friend's theory.

"Yes, of course," he cried aloud, "and if the situation of the mine can be pretty accurately located the numbers referring to the seconds are indispensible. That was why Robertson sent Nos. 6 and 12 to the Dreyel cousins for safety, and why Ferail began his murderous work. Wallion, you have solved the mystery of King Solomon."

Wallion shook his head.

"No," he said. "I fancy I am pretty near it, though. Who is No. 13 Toroni? Where does he hail from? As I have represented things there are still various discrepancies. Can a mine disappear so entirely in the space of sixteen years? Could those fellows that drove away in Dixon's car have set to work in peace and quiet to exploit a stolen gold-mine? Why did not Robertson and the Dreyels go back again if it could be worked anew? No, King Solomon remains a riddle to us, my friend."

Tom relapsed into his former state of depression. What was the use of speculating when Elaine might be on the road to renewed dangers? He jumped up and began a wild attack on the door. "We must get out of this!" he said angrily.

Wallion, who had risen, walked to the window, turned round sharply, and said:

"Pull yourself together, man, in five minutes relief will come."

Tom, bewildered, muttered: "How?" Half hopeful, half in doubt.

"I rather think McTuft is standing by the gate," was Wallion's laconic reply as he fumbled for his knife, which he threw with all his might against the window between the bars; the panes broke with a crash which in the dead silence could be heard for a great distance, and almost immediately light footsteps sounded on the gravel outside.

"McTuft!" Wallion called out.