"What does it mean?" she pleaded. "I feel so frightened. What did that man want?"

"You need not be afraid of that man, or any other man," said Tarling briskly. "I'm sorry you were scared."

He succeeded in calming her by the time her servant had returned and then took his leave.

"Remember, I have given you my telephone number and you will call me up if there is any trouble. Particularly," he said emphatically, "if there is any trouble to-morrow."

But there was no trouble on the following day, though at three o'clock in the afternoon she called him up.

"I am going away to stay in the country," she said. "I got scared last night."

"Come and see me when you get back," said Tarling, who had found it difficult to dismiss the girl from his mind. "I am going to see Lyne to-morrow. By the way, the person who called last night is a protégé of Mr. Thornton Lyne's, a man who is devoted to him body and soul, and he's the fellow we've got to look after. By Jove! It almost gives me an interest in life!"

He heard the faint laugh of the girl.

"Must I be butchered to make a detective's holiday?" she mocked, and he grinned sympathetically.

"Any way, I'll see Lyne to-morrow," he said.