“The young detectives have been placed in a position where they can make no more arrests. Why?

“A certain reporter is said to have unusual influence and power with the City Council and civic officials. Why?

“I am the Voice. I bid you good-night.”

Once more the instrumental trio was on the air.

“Who is this Voice?” Johnny asked himself. “How did he know all that?”

He thought of “The Ferret.” Now he recalled that he had said something about the Voice. But what voice? Was it this voice? He could not be sure.

“Have to ask him,” he told himself. At that, he was not sure he would ask “The Ferret.” Some affairs are best left secret. This Johnny knew well enough.

He went to the telephone and called a number. Ten minutes later he was out of the shack and on his way to the entrance of the city’s freight subway. He had gained permission to spend the night there. And such a night as it was to be!

CHAPTER XVIII
IN THE TUNNEL AT NIGHT

The narrow tunnels far beneath the din of this vast city’s streets were built in the main to serve great enterprises. The steel cars that rattle on and on through the night carry coal to factories and many-floored department stores. The lighter cars, with frames of wood, transport shipments of goods from the stores to outlying districts where they are loaded on trucks and delivered. Manufactured goods are hurried away to warehouses and depots.