“Please tell him I am coming at once, and order round my car. And be ready yourself as soon as you can.” I needed no injunction to make haste. I was in a fever to be back at the scene of that masked revel, and find out what had happened there. I congratulated myself on the care I had taken to cover my own tracks. I had left the doctor’s house and returned to it in my ordinary clothes. Not a soul in the Domino Club, except the member from whom I had obtained a ticket of admission, could have the least idea of my identity. So far as I could see I was absolutely secure from discovery. But it had been a dangerous game to play, and Tarleton was a dangerous man to play against. With all his kindness for me I trembled at the thought of coming within the range of his uncanny powers of detection. As soon as I had dispatched his messages, and put a pot of coffee on to boil over a little spirit stove, I sluiced my head in cold water, and got into my clothes again as quickly as I had got out of them. I was ready with a steaming cup of coffee for my chief as he came out of his room, and was rewarded by the heartiness with which he gulped it down. His square leather bag, fitted with everything likely to be needed for the treatment of a poisoning case, was always kept ready in his bedroom, and he had it in his hand. I relieved him of it not presuming to bring my own; and we found the car waiting for us when we opened the front door. As we rolled through the streets, just beginning to show signs of life, Tarleton acquainted me with the personality of Inspector Charles. “He’s a retired Army man; he likes to be called Captain Charles. He’s also the younger son of a peer but he doesn’t like that noticed. His family are silly enough to object to his being in the police, and he drops the Honourable on their account. But of course it’s known in the Yard, and he gets most of the society jobs in consequence. I suppose they think he’s more likely to know his way about among the big people. But if you ask me, I think an experienced valet knows ten times more. You’ll find Charles straight, and you’ll find him thorough, but you needn’t expect him to see an inch beyond his own nose.” This was comfortable for me. But the next words of my chief gave me an awkward jar. “By the way, you ought to be able to tell me something about the place we’re going to--what is it?--the Domino Club. It sounds like the sort of night haunt the Home Office objected to so much when I asked for you as my assistant.”