“What to blazes!” he said. “What’s that?”

“Turn around! Right under this arc light. Say, Chief, how did you get that spot of black on your neck? You’ve smeared it all over your collar.”

“I don’t know. What’s it look like?”

“Soot!”

“Soot?”

“Sure, Chief. Lampblack or soot!”

Drew arched his dark brows as he rubbed his finger-tips together. He held them up to the stronger light. He turned and glanced back through the silent walls of the street down which they had walked. He took one step toward the east.

“Hold on!” said Delaney. “Where are you going?”

“Going back!”

“Why, Chief!”