Blake pointed to the paper silently and O'Toole picked it up. He read quickly, his eyes darting from side to side of the page. His face grew purple.

"They certainly pulled a fast one," he growled. "A whole train missing, with the owner of the line and his daughter on it. I never stopped to think what that might mean when the papers got hold of it."

"Nor I," Blake admitted. "But Harror did, and if I'm not mistaken, someone with a lot more brains than Harror had the same idea. This thing was carefully planned, O'Toole, but there are two points that the Silver Masks overlooked."

O'Toole looked at him questioningly.

"One was they didn't expect you and me to cause the trouble we're going to," Blake went on, "and the other is Wade. He's around somewhere. He may help us out at the right time."

O'Toole spat disgustedly.

"We can cause trouble if we ever get out of here," he admitted. "I'm not so sure of Wade."

A shaft of light cut in through the window suddenly, blinding them both.

They stared out with wide eyes. A murmur of voices from the car told them that the others were awake, and also impressed by what they saw.

Mono 6 was in a great cavern. Great black granite walls towered high above. The mono train had evidently entered the cave slowly and slipped between a long row of huge boulders that held it upright. The cave was a graveyard of mono cars. They lay across the full width of its floor, dismantled and torn apart for whatever value they had to offer.