“I am still convinced that he was there when the murder took place in the garden.”
“Ah, that is another matter. He may have been present at both murders, and yet committed neither.”
“I see now what you are driving at. You mean that there may be a fourth man involved?”
“That may be so; but I was not quite sure on that point. What the evidence seems to me to establish beyond reasonable doubt is that some meeting of the three men—Prinsep and George and Walter Brooklyn—took place at Liskeard House that night. That meeting was followed by—probably resulted in—the death of two of the three. There may have been others present. That is for you to find out. But I am clear that the next step is to discover what this meeting was about, and who was there. If we knew that, it would probably throw a new light on the whole situation.”
“In the circumstances, there is still, it seems to me, every reason for arresting Walter Brooklyn. He was certainly present, whether he committed murder or not.”
“I think it will be best to leave him at large for the time being. We have, I think, ample evidence of his presence in the house, but not of his having had a guilty hand in the murders. I think, instead of arresting him, it will be far better for you to see him, and find out all you can about what happened that night.”
“Very well. I will try to see him at once. Ought I to warn him that what he says may be used against him?”
“I must leave that to your judgment. And now, inspector, I fancy you are a bit discouraged by the result of our talk. You came here with your mind made up, and you have found that the case is not so straightforward as it was beginning to appear. But that is no reason at all for being discouraged. The evidence you have gathered is of the greatest value. It has enabled us to put our hand on some one who, we are practically sure, knows all about the murders, whether or not he actually committed one of them. Once again, let me congratulate you on a very fine day’s work.”
The inspector was only in part reassured by Superintendent Wilson’s conclusion. He had been watching his superior intently, and had noticed the keen critical joy with which he had demolished the apparently overwhelming case against Walter Brooklyn. The inspector had been compelled to admit, even to himself, the force of his superior’s arguments; but, when he left the room, he remained, somehow in spite of this, convinced that Walter Brooklyn was not merely an accessory, but the actual murderer of one, if not of both men, and with a strong suspicion that the apparently conclusive evidence that Prinsep had killed George Brooklyn had a flaw in it somewhere, if only he could find it.
But he could not attend to his instincts for the moment. His next business was to see Walter Brooklyn, and find out from him all he could. At the least, Walter must know a great deal. Most probably he knew the whole story. But how much would he tell?