Instinctively Ramey raised it to his shoulder. It balanced like an archer's crossbow, except that it had neither stock nor projectile grooves. That it was a weapon of some sort he had no doubt. An impulse stirred him to press the stud beneath his trigger finger, but he subdued it. It would be folly to test a weapon of unguessed nature in such confined quarters.

In this weird moment he had forgotten everything save his own excitement. Now a cry dragged him back from the world of wonder to the world of actuality.

"The door!" roared Lake O'Brien. "It's closing!"

Whirling, Ramey saw the unguarded metal shield swinging shut. With a hoarse cry he leaped toward it. His shoulder and that of Lake smashed it at the same time. But the bruising impact was in vain. Even as they struck it there came the snick! of clasping locks. They were sealed in the metal cube. And Syd O'Brien's voice told why.

"It didn't close!" roared Syd. "It was closed on us—intentionally! Tomasaki!"

Ramey, glancing about him, realized that of their number all were present but the little brown man. Suspicion, latent until now, flared into sudden understanding.

"Then he's the one! The one who showed the Japs the 'plane, told them who I was! He's been with them since the beginning. Sneaked around to betray us at the east gate, and probably shot Sirabhar himself when Sirabhar tried to warn us."

Lake boomed, "By God! That's why he offered to go after supplies! So he could reveal our hiding place. He's probably gone to fetch the Japs now, the traitorous little—"

As ever, Dr. Aiken's head was levelest in a crisis.

"There are Quislings in all races," he said sadly. "It's too bad we discovered the enemy in our midst so late. But we have no time to waste in recriminations. We must get out of here before the soldiers come. The ladder—where does it go?"