"How does this gang, as you call it, operate?" asked Garrick.

"Most of the cars that are stolen," explained McBirney, "are taken from the automobile district, which embraces also not a small portion of the new Tenderloin and the theatre district. Actually, Garrick, more than nine out of ten cars have disappeared between Forty-second and Seventy-second Streets."

Garrick was listening, without comment.

"Some of the thefts, like this one of Warrington's car," continued McBirney, warming up to the subject, "have been so bold that you would be astonished. And it is those stolen cars, I believe, that are used in the wave of taxicab and motor car robberies, hold-ups, and other crimes that is sweeping over the city. The cars are taken to some obscure garage, without doubt, and their identity is destroyed by men who are expert in the practice."

"And you have no confidence in the police?" I inquired cautiously, mindful of his former manner.

"We have frequently had occasion to call on the police for assistance," he answered, "but somehow or other it has seldom worked. They don't seem to be able to help us much. If anything is done, we must do it. If you will take the case, Garrick, I can promise you that the Association will pay you well for it."

"I will add whatever is necessary, too," put in Warrington, eagerly. "I can stand the loss of the car—in fact, I don't care whether I ever get it back. I have others. But I can't stand the thought that my car is going about the country as the property of a gunman, perhaps—an engine of murder and destruction."

Garrick had been thoughtfully balancing the exploded shell between his fingers during most of the interview. As Warrington concluded, he looked up.

"I'll take the case," he said simply. "I think you'll find that there is more to it than even you suspect. Before we get through, I shall get a conviction on that empty shell, too. If there is a gunman back of it all, he is no ordinary fellow, but a scientific gunman, far ahead of anything of which you dream. No, don't thank me for taking the case. My thanks are to you for putting it in my way."

CHAPTER III