“What’s the matter, Joe?”

“Matter? When will the inspector be here? I want him to see this. It looks real, too—”

Before Cardona could explain further, Fennimann walked in the door. He stopped short when he observed the expression on the face of the star detective.

“What’s up?” he inquired.

“Double Z again!” declared Cardona.

“No! Let me see it.”

“Wait,” replied Cardona. “I’ll read it.”

Holding the paper with both hands, he repeated the message aloud:

“To-day is the last for Arnold Bodine. He will be killed before midnight, unless you prevent. Warn him!”

“Signed by Double Z?” questioned Fennimann.