“Just the way I feel about it, old fellow,” was his chum’s rejoinder. “I’d give a lot to unravel the mystery and—hello! Look there!”

Right ahead of them seemingly a light had suddenly flashed up out of the darkness. It was out of the path of the search-light and shone quite brilliantly. The light was in about the location where they had last sighted the gray night rover.

“Out with that search-light instantly,” ordered Captain Ralph snappily.

Instantly the bright rays of the big electric night-piercer were cut off.

“Now switch off the other lights, the running lamps and the stern one.”

Harry Ware hesitated an instant.

“You are going to run without lights?”

“For a time, yes.”

Snap!

Out went every light on board the River Swallow that might betray her whereabouts to any other craft.