“No. We were in the living room most of the time. A few of the gentlemen came in here, but after we had gone out, I locked the door. I don’t usually keep this room open. It serves me as an office at home. I explained that to them. I never come in here in the morning. The room is kept locked until I return from downtown. Then, at dinner time, I lock up until the next day.”
“The room was open when I came,” said Cardona.
“Of course,” replied the millionaire. “There is nothing of value here, and Ralph, the butler, has a duplicate key. I called from the office and told him to show you in here.”
“I see. Now, regarding this note of Double Z. According to the postmark, it was mailed from the Bronx about midnight.”
“Yes. I noticed that.”
“All of the notes come from the Bronx.” The detective hesitated. “That may mean something — it may also be a blind. One thing is certain: it is a genuine Double Z note. It has been compared with the others that we have at headquarters.”
“You have quite a collection?”
“Yes.”
“All threats?”
“No. A few are tips. One in particular enabled us to forestall a plot against the Fascist delegate to America. That is why the note addressed to you is both right and wrong.”