but as Chester's revolver covered him steadily, he changed his mind and
stood still.

Immediately the others began the work of reviving the ambassador, and
five minutes later their efforts were rewarded. The ambassador moaned
feebly, and a few seconds later sat up. His eyes fell on Robard, and he
jumped quickly to his feet.

"So!" he exclaimed. "Guard him carefully, boy. He's a dangerous man."

"I'll guard him," replied Chester briefly.

Suddenly the Austrian smote himself on the breast.

"The plot!" he cried. "Robard's plot!"

"Has failed," interrupted Chester. Then noticing the look of surprise on
the ambassador's face, he explained.

"We overheard the conversation in the room where we were locked, sir. My
friends managed to escape and give the warning. The plot has failed.
Robard told me as much."

"I'm glad," said the ambassador simply. "And now, what am I to do
with you?"

"Let me go, sir," was the lad's reply.

The ambassador considered the matter.