“The one clue that no one else could furnish.”
He stood erect, alert, his eyes glinting.
“We’ve got work to do. Let’s get going!”
Chapter 38
THE VIGIL
“Blue glow,” Roger gasped. “Are you going to have fireworks too?”
“No. You will adjust the big sun-lamp so it sends rays upward. Put the blue filter from the star-reader’s plant beds on it. It is only fair that part of his equipment should help catch and round up the one who struck him.”
Roger, with nothing but thoughts to occupy him, went to prepare the signal. He could hear Grover making calls. To a police Bureau. To his staff men. To Falcon’s patrol agency.
To Roger it appeared to be as dense a mystery as ever; but to his brilliant cousin something had torn aside the fog.
He tried to fathom that evasive clue. He went over his ideas. Claws on glass? No! Then what, besides? Something he should recognize in the light of what he knew. Something that the miscreant had imagined him bright enough to have guessed, perhaps.
It escaped him, eluded his every attempt to read that riddle.