"No; that is so. They are typical poisoners of the worst kind; of the intelligent, cautious, resourceful kind. They are a standing menace to society. As long as they are at large, human lives are in danger, and it is our business to see that they do not remain at large a moment longer than is unavoidable. And that brings us to another point. You had better keep indoors for the next few days."
"Oh, nonsense," I protested. "I can take care of myself."
"I won't dispute that," said Thorndyke, "although I might. But the matter is of vital importance and we can't be too careful. Yours is the only evidence that could convict these people. They know that and will stick at nothing to get rid of you—for by this time they will almost certainly have ascertained that the tea-shop plan has failed. Now your life is of some value to you and to another person whom I could mention; but apart from that, you are the indispensable instrument for ridding society of these dangerous vermin. Moreover, if you were seen abroad and connected with these chambers, they would get the information that their case was really being investigated in a businesslike manner. If Weiss has not already left the country he would do so immediately, and if he has, Mrs. Schallibaum would join him at once, and we might never be able to lay hands on them. You must stay indoors, out of sight, and you had better write to Miss Gibson and ask her to warn the servants to give no information about you to anyone."
"And how long," I asked, "am I to be held on parole?"
"Not long, I think. We have a very promising start. If I have any luck, I shall be able to collect all the evidence I want in about a week. But there is an element of chance in some of it which prevents me from giving a date. And it is just possible that I may have started on a false track. But that I shall be able to tell you better in a day or two."
"And I suppose," I said gloomily, "I shall be out of the hunt altogether?"
"Not at all," he replied. "You have got the Blackmore case to attend to. I shall hand you over all the documents and get you to make an orderly digest of the evidence. You will then have all the facts and can work out the case for yourself. Also I shall ask you to help Polton in some little operations which are designed to throw light into dark places and which you will find both entertaining and instructive."
"Supposing Mrs. Hornby should propose to call and take tea with us in the gardens?" I suggested.
"And bring Miss Gibson with her?" Thorndyke added dryly. "No, Jervis, it would never do. You must make that quite clear to her. It is more probable than not that Mrs. Schallibaum made a careful note of the house in Endsley Gardens, and as that would be the one place actually known to her, she and Weiss—if he is in England—would almost certainly keep a watch on it. If they should succeed in connecting that house with these chambers, a few inquiries would show them the exact state of the case. No; we must keep them in the dark if we possibly can. We have shown too much of our hand already. It is hard on you, but it cannot be helped."
"Oh, don't think I am complaining," I exclaimed. "If it is a matter of business, I am as keen as you are. I thought at first that you were merely considering the safety of my vile body. When shall I start on my job?"