"No, I think it was the man Koku thought was a chicken thief,
and whom we chased the other night. I've got to be on my guard. I
wonder if--"

Tom was interrupted by the appearance of Koku, who came out of
the shop with a letter the postman had just left.

"I don't know that writing very well, and yet it looks
familiar," said Tom, as he tore open the missive. "Hello, here's
more trouble!" he exclaimed as he hastily read it.

"What's up now?" asked Ned.

"This is from Mr. Period, the picture man," went on the young
inventor. It's a warning."

"A warning?"

"Yes. He says:


"'Dear Tom. Be on your guard. I understand that a rival moving
picture concern is after you. They want to make you an offer, and
get you away from me. But I trust you. Don't have anything to do
with these other fellows. And, at the same time, don't give them
a hint as to our plans. Don't tell them anything about your new
camera. There is a lot of jealousy and rivalry in this business
and they are all after me. They'll probably come to see you, but
be on your guard. They know that I have been negotiating with