Genter nodded. He knew that aristocratic suburb.

“There’s a man there that has got to be coshed. He comes home from his club every night by the eleven-five. Walks to his house. It is up a dark road, and a fellow could get him with a club without trouble. Just one smack and he’s finished. It’s not killing, you understand.”

“Why does he want me to do it?” asked the tall tramp curiously.

The explanation was logical.

“All new fellows have to do something to show their pluck and straightness. What do you say?”

Genter had not hesitated.

“I’ll do it,” he said.

Carlo returned to the window, and presently he called his companion.

“Stand here and put your left arm through the window,” he ordered.

Genter pulled back the cuff of his soddened coat and thrust his bare arm through the opening. His hand was caught in a firm grip, and immediately he felt something soft and wet pressed against his wrist. A rubber stamp, he noted mentally, and braced himself for the pain which would follow. It came, the rapid pricking of a thousand needles, and he winced. Then the grip on his hand relaxed and he withdrew it, to look wonderingly on the blurred design of ink and blood that the tattooer had left.