Frank followed instructions without question.

Suddenly Jack came into contact with a figure in the darkness. The lad shoved him to one side and the two darted by. Other figures now blocked the passage. They were the men who had passed out ahead of the lads.

There were hoarse cries of alarm and surprise; but unheeding these, the two boys ran on. The advantage was theirs, for the Russians, although realizing something was wrong, could not see them and did not know the causes of all the trouble were so near.

Frank and Jack turned into the last passageway safely. And there it became light.

Before the door at which stood the first guard was a light. The guard himself, attracted by the sounds of commotion from behind, faced the lads as they turned into the passage, a drawn revolver in his hand.

“Halt!” he cried.

Without pausing in his stride, Frank raised his own revolver and fired around Jack’s side. The Russian dropped.

Jack pulled up before the door.

“Pull it open!” cried Frank.

Jack laid hold of the knob and pulled. The door did not budge.