"I wonder what he is doing there?"

Then a thought struck Phil Forrest like a blow.

"That's where they put the big net between performances."

Phil crept down into the arena and made his way back to the entrance to the menagerie tent, where he quickly slipped out into the open and ran down along the outside of the big top at his best speed. As he drew near the spot where he had seen the man, he moved cautiously.

Finally Phil dropped down and peered under the tent. He was less than ten feet from where the fellow was at work. The Circus Boy could catch a "rip, rip" now and then.

"The fiend is cutting the net," he muttered. "I wonder who he is. Ah, I know him now! He is one of the tent men. I never thought he was in this thing. I must catch him—I must make the attempt, for he may get away. I don't even know the fellow's name, nor do I understand his enmity toward the show or myself."

Phil wriggled in under the tent, now, not fearing discovery, for inside the tent, it was quite dark. Slowly raising himself to his feet, he edged nearer, step by step, to where the man was at work. The man had partly spread the net out by this time, to make sure that he was cutting it in the right place so that it would give way beneath the weight of the performer unfortunate enough to drop into it first.

"The fiend!" repeated Phil, clenching his fists. "I'm glad I am the one to discover him. Mr. Man, I have a score to settle with you and I'm going to begin the settling up now."

Phil crouched low. He was now only a few feet from the stooping figure.

All at once the boy threw himself forward. He landed on the man, forcing him to the ground. As he struck, Phil raised his voice in the showmen's rallying cry.