Cardona was announced, and a minute later the detective joined the group. His face showed eagerness as he sat down opposite the commissioner.
He looked quizzically at Arthur Wilhelm, and expressed pleasure when he learned the man’s identity.
“Fine!” he exclaimed. “We’ll have to get back to the Harshaw murder. Any one who knew the old man will be valuable.
“I’ve been checking up on the others to-day, and I’ve got a thread toward each of them. Don’t expect too much, commissioner — we’re just at the beginning.
“But I think that with Professor Biscayne on the job, we’re going to gain results.
Cardona picked up a brief case that he had brought with him. He removed a sheaf of notes and referred to different pages.
“I shall go back,” he said. Without realizing it, Cardona was echoing The Shadow. “Throckmorton kept a diary. Not one — a lot of them.
“I found some of the books this morning. Right in the first one I picked up, I found a clew.”
“Where did you find the diary?” queried Biscayne.
“In the closet of the room where he was when the gas got him,” said Cardona. “Here’s the book” — he produced it from the brief case — “and here’s the dope. Throckmorton knew Harshaw!”