Tanza lighted a fresh cigarette and sipped his after-luncheon coffee with a ruminating air.
"I want your assistance," he said. "I think it will be worth your while. It isn't every day that I come across a criminal problem that interests me, but I think I have found one in the case of the mysterious death of Mrs. Charlock's French maid. Charlock is a man difficult to approach and resents interference of any kind. As it happens, you are acquainted with him, which makes our task easier. Between ourselves, I mean to get to the bottom of that affair, because I feel certain that here is a new phase of crime."
"Why do you think so?" Grey asked. "I read the account of the inquest and I didn't notice anything out of the common. I don't see how a woman of her class could have enemies in her household. She was a self-contained foreigner, mainly interested in saving money, and she seems to have kept apart from the rest of the domestics. The rest of the servants are English and appear to be of a humdrum, respectable type. As far as I can see, her death happened naturally. The woman was fooling about by the fountain, slipped on the marble and stunned herself against the sundial. That would account for the bruise on her forehead. She was unconscious when she fell into the water and consequently was drowned. The thing is simple."
"That is because you haven't studied the subject," Tanza said placidly. "I flatter myself that I have an unerring instinct for this class of thing, and that is why I feel sure that we have dropped upon something new in the way of crime. You have forgotten that the doctor who made the post-mortem testified that there was little or no water in the lungs, which is rather against your drowning theory. Besides, one of the witnesses said that the woman's clothing was slightly singed. And, in addition to this, what could the Frenchwoman want in the garden at that early hour in the morning? Charlock swore that she was in the house just before daybreak, and soon after it was light he himself found her lying in the fountain. Depend upon it, she went to keep an assignation and met her death that way."
"What, in broad daylight?" Grey asked.
"That," Tanza said, with the air of a connoisseur, "is just where I am puzzled. It must have been nearly broad daylight, at any rate, when the woman left the house, and the sundial was in full view of the front windows. We've a precious clever rascal to deal with, I know. I have gone into all the records of new and ingenious crimes, and in all my experience I can find nothing to fit this case. That is why I called you in. The murderer is up-to-date and uses all the modern appliances which are not as yet known to the police. A good many of them may still be outside the ken of the average scientist. And the more my mind dwells upon the matter the more sure I am that science has been invoked by our miscreant. As you are well versed in all the latest discoveries, I asked you to spend a few days with me and make an examination of the scene of the trouble."
"Shouldn't we be rather intruding?" Grey protested. "Charlock is a very queer sort of man."
"I know that. In writing to him for his permission to test certain of my theories I mentioned that I was a friend of yours and that I should bring you along. I received a characteristic reply to the effect that I had best mind my own business, but that so long as you answered for my bona fides no objection would be made. So we are going off this afternoon, and here is the boat coming to fetch us. I don't expect a very warm reception."
John Charlock was walking about the grounds when his visitors arrived. Despite his sternness he looked miserable. For the time being he could not work. He felt that he would be able to do little or nothing until he had disposed of his expensive household. He had another plan, too, in his mind, but for the moment it was not ripe for execution. He extended a more or less cordial welcome to Grey, but his manner to Tanza was chilly. If the latter noticed it, he did not disclose the fact.
"This is very good of you, my dear sir," he said. "I hope you will not think I am here out of mere curiosity, for I am quite convinced that the death of your wife's maid was no ordinary occurrence. Having devoted most of my life to the study of crime, my experience tells me——"