The two Secret Service men were just coming up.

"What is it?" cried Harry. "Where's Alice? I have called her several times, but she don't answer."

"Why, I left her right here, and that box with her; both seem to have vanished," Old King Brady answered in a tone which fully betrayed his anxiety.

But it was easy to mistake the exact position in the fog.

A moment's search revealed the puzzling fact that nowhere on the bulkhead Alice and the heavy box containing the imprisoned princess was to be found.

The Bradys and the Secret Service men pushed about everywhere.

One of the first things they did was to turn the corner of the end warehouse and look there along the street.

"She has been captured and carried off. She must have gone this way," Harry exclaimed.

"Or into one of the warehouses," said Old King Brady.

"I'll get up the street. You get along by the warehouses," cried Harry, and he started away on the run.