Now, as he surveyed the surroundings, he realized that the light could not have been reflected from any illumination in street or building.  The glow from the water had appeared close to the wall of the empty building through which his four assailants of the night before had made good their escape.

As he stood there, slouching in the shadows, Johnny gave a great start; the light had appeared again.  Beyond question it was beneath the water, not shining upon it.  From this vantage point the light seemed stronger.  It appeared for a few seconds, then disappeared again.  Johnny scratched his head.  What could it mean?  For some time he stood in a brown study, then he laughed silently to himself.

“Probably phosphorescent substances being sent out from the drainpipe of a factory or chemical laboratory,” he decided.

At that instant he was all alert.  His hand closed on his automatic.  A stealthy footfall had sounded on the bridge.

“Oh!  It’s you,” he whispered a moment later.

Hanada grinned as he gripped Johnny’s hand.  “Thought I might miss you,” he whispered.

The two were soon engaged in animated conversation.  Their talk had to do with Johnny’s adventure of the night before and the information regarding the Radicals furnished by Jerry the Rat.  Hanada appeared unduly excited at the news.

“It seems,” said Johnny, “that there must be a national conference of Radicals meeting somewhere near this river.  Perhaps our old friend, the Russian of Vladivostok, is a delegate.”

Hanada shot him a swift glance, as if to say:  “How much do you know about this matter anyway?”

But for some time the Japanese did not speak; then it was concerning an entirely different affair.  Cio-Cio-San had been visited by a fellow countryman who, although wholly unknown to her, had appeared to know a great deal about her private business.  He had informed her that she had, within the last year, been robbed of some very valuable property and professed to have a knowledge of its whereabouts.  If she would accompany him he would see that it was restored to her.  The actions of the man had aroused her suspicions and she had refused to go.  However, she had asked him to give her a day to think it over.  He was to return at nine this night.

“Some nifty little mind reader, that Jap,” smiled Johnny.  “Tell him to come round and locate my long lost uncle’s buried treasure.”

However, though he passed the matter off as a jest, he was doing some very serious thinking about this rather strange affair.  He had never told Hanada about the diamonds.  Neither had he told of the note which had been thrust under the door.  Now he remembered that Jerry the Rat had spoken of a Jap as a member of the Radicals, and he wondered if Cio-Cio-San’s visitor was the same man.  If that were so, then what was his game?  Was he planning to lead Cio-Cio-San into a trap?  Certainly if the treasure the strange Jap had spoken of as having been stolen from the Japanese girl was the envelope of diamonds, and they had hoped to recover them from Johnny that night, they would have no intention of restoring them to Cio-Cio-San.