"Our assailant is left-handed. Also—the limp may be something temporary. All right, Forsdon, it's all yours. Seven to twelve days, and you'd better plan on seven."
He went back to his office, and I looked at Walker. "Can you give me any idea at all as to the location?"
"I can draw you a circle on the map, but it's only about fifty-fifty that you'll find the place inside the circle."
"That's better than nothing."
"There is one thing," Walker said. "I'd like to have you wear this. Everywhere."
A band of elastic, with what looked like dark beads placed on it at intervals.
"It's an arm band," Walker said. "Cronus picks up these beads as bright spots. So I'll be able to identify you if you show up on the screen."
I hesitated, and he said, "The Captain wears one. We know it works, because Cronus has picked him up twice."
I took the arm band, and slipped it on.
I sat down with the map and a directory and worked until a technician came back with the developed film. Walker was still perspiring in front of Cronus. He hadn't been able to focus on the crime a third time. The Captain's door was closed, and his nasal voice was rattling the door as he bellowed into his telephone. I pulled the curtains to darken one corner of the room, and fed the film into a projection machine.