“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 teashop 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?”