"It would take an expert to tell them apart," said Mr. Moyne, as he examined the coupons closely. "Well, what are we to do?"

"In the first place," declared Joe, "we must change our form of general admission tickets at once. That will stop the fraud, graft, or whatever you want to call it. Then we must do as Mr. Waldon says—look for the guilty parties. We'll have to hire some detectives, I think."

This plan was voted a good one, and steps were at once taken to change the form and style of the general admission tickets. Joe also wired for a man from a well known detective agency to meet the show at the next town. Then the printing shop which made the circus tickets was communicated with.

That was all that could be done at present, and Joe gave his attention to perfecting his new fire-eating act.

He did not give up his mystery box trick, and he still presented the vanishing lady illusion, Helen assisting in both of these. Joe also did the big swing, which always caused a thrill on account of the danger involved. Careful watch was kept over the trapeze and other apparatus so that no more dangerous tampering could he attempted, and Joe always looked over everything with sharp eyes before trusting himself high in the air.

"Some one evidently has a grudge against me as well as against the circus in general," he said to Jim Tracy.

"Maybe it's the same person," suggested the ringmaster.

"Perhaps. Well, as soon as we get some word from the detectives we can start on the trail."

The circus had arrived at a large city, where it was to show three days and nights, and preparations were made for big crowds, as the city was the center of a large number of industries, where many thousands of men were employed at good wages.

"We'll play to 'Straw Room Only' at every performance," said Mr. Moyne, rubbing his hands with glee as he thought of the dollars that would be taken in. "And I'm glad we discovered the bogus tickets in time. We'd be out a lot of money if the counterfeits were to be used here."