“Let’s get one up. Send the chief a Black Hand letter warning him not to take that train.”

“And if he ever found who wrote it, we’d all be up to our necks in trouble,” pointed out Joe. “I’d like to put a bomb under his old police station.”

“Fine idea!” applauded Tony. “Where we get the bomb?”

“Leave it to me,” announced Chet Morton mysteriously. “I’ll get a bomb. I’ll guarantee to keep the chief in town.”

“Not a real bomb?” asked Frank.

“Why not?” said Chet. “Listen to me.”

Chet proceeded to lay forth his plan in a stealthy whisper. It was received with chuckles and murmurs of admiration. His companions clapped him on the back, and when he had finished the boys hastened down the street toward the Hardy home.