Biscayne nodded as he received the letter and quoted aloud:
“My visits to you were in vain. You failed me. All have been against me… I have prevailed… You missed your greatest opportunity…”
Cardona was pondering. He smacked his fist against his other palm and looked up at his companions.
“These letters were going to be mailed,” he declared. “The old man must have changed his mind. He sent Thomas Sutton a typed letter, but used the envelope that he had prepared for this one.
“All those death notes must have come from Harshaw — even the one about himself! But who sent them?”
“Harshaw sent them,” declared Biscayne suddenly. “Sent them from this apartment. He must have intended to send these letters, too — probably while he was away.
“When did you advise him to take a trip, Doctor Fredericks?”
“Often,” said the physician. “He never wanted to go. He said he was afraid to leave. When I urged him, he said that he would make plans so he could go.
“When I finally told him he must go away, he agreed to leave at once—”
“That’s it!” exclaimed Biscayne. “He had these letters ready. He wanted them to be delivered while he was away, so that his enemies would think he was at home.