He paused to stare at a man who had entered the office. It was the man who had come there one time before — Terry Blake, of the secret-service.
“Perhaps I can help you,” said the new arrival.
“To find the source of the Double Z letters?” quizzed Cardona.
“Yes.”
“Where is it?”
“I can take you there.”
“When?”
“Now.”
“How many men will I need?”
“Bring two.”