“We haven’t seen him at all!” stated Ned, just as firmly.

“We shall have to search the vessel!” affirmed the orderly. “You will please remain aboard for a short time.”

Quickly ascending the ladder the man summoned another soldier from the shore. Together the two made a hasty examination of the boat.

Unable to discover any trace of the missing prisoner they shook their heads as if greatly puzzled. Now and again they glanced at the boys, exchanging at the same time comments in German.

“Come with us,” finally said the first visitor.

Obediently the lads followed ashore. They were conducted to the office building, where they were shown into the presence of General Gruenwold at once. In a few words the orderly stated the case.

“This looks serious, boys,” commented the General. “Can you not explain the whereabouts of Mackinder? He is a prisoner, you know!”

“We know nothing of the man!” declared Ned, earnestly. “We don’t like him and surely would not think of assisting him to escape!”

“If you please, sir,” began the orderly, “it is the opinion of my comrade and myself that the boys have done away with Mackinder!”