No one was speaking now, so Cardona used the opportunity to make a disclosure that would surely meet with commendation.
“Regarding these notes,” he said. “If there’s a third, we’ll know where it came from. I’ve had the post office working on the letters.
“We know already that they were mailed from somewhere close to the Redan Hotel. They’re on the watch now for No. 3.”
“Good!” said Biscayne.
The commissioner nodded approvingly. “I’ve got plenty of work cut out tonight,” said Cardona, rising. “But I’m going to be pretty close to the Redan Hotel, all along. There’ll be other men around there, too — laying low. If Mayhew gives the signal, there won’t be a chance for the guy to get away.”
Biscayne arose also. He accompanied Cardona as they left the commissioner’s office. The two men chatted in a friendly manner on their way to the ground floor.
When they reached the street, Biscayne hailed a cab. He paused to make a few low-voiced remarks as he shook hands with the detective.
“I’m making it my job to work with you, Cardona,” he said. “You can count on me in any way. Whatever theories I have are for your benefit. You’re the man who gets the results.”
“All right, professor,” said Cardona agreeably. “I’m going to get the murderer, no matter how big he is. I’ll get him even if he happens to be—”
“The Shadow,” interposed Biscayne, as he stepped into the cab.