"It may be," he replied evasively. "Clues are funny things, Miss Morrison; you never know when you may pick one up, nor how. I shouldn't say anything to anybody about this fifth pigeon if I were you. Let that be our secret for awhile; and if your father wants to know why I sent for you to come up here again--why, just say I have discovered that your pigeons are dead for want of food." And for a moment or two, after she had closed the door and gone below again, he stood looking at Mr. Narkom and slowly rubbing his thumb and forefinger up and down his chin. Then, of a sudden: "I think, Mr. Narkom, we can fairly decide, on the evidence of that fifth pigeon, that George Carboys left this room voluntarily," returned Cleek; "that the bird brought him a message of such importance it was necessary to leave this house at once, and that, not wishing to leave it unlocked while he was absent, and not--because of the Captain's inability to get back upstairs afterward--having anybody to whom he could appeal to get up and lock it after him, he chose to get out of this window, and to go down by means of that wistaria. I think, too, we may decide that, as he left no note to explain his absence, he expected to return before morning, and that, as he never did return, he has met with foul play. Of course, it is no use looking for footprints in the garden in support of this hypothesis, for the storm that night was a very severe one and quite sufficient to blot out all trace of them; but--Look here, Mr. Narkom, put two and two together. If a message was sent him by a carrier pigeon, where must that pigeon have come from, since it was one of Miss Morrison's?" "Why, from Van Nant's place, of course. It couldn't possibly come from any other place." "Exactly. And as Van Nant and Carboys lived together--kept Bachelor Hall--and there was never anybody but their two selves in the house at any time, why, nobody but Van Nant himself could have despatched the bird. Look at that fragment of burnt paper lying in the basin of that candlestick on the washstand. If that isn't all that's left of the paper that was tied under the pigeon's wing, and if Carboys didn't use it for the purpose of lighting the spirit-lamp by which he heated his shaving-water, depend upon it that, in his haste and excitement, he tucked it into his pocket, and if ever we find his body we shall find that paper on it." "His body? My dear Cleek, you don't believe that the man has been murdered?" "I don't know--yet. I shall, however, if this Van Nant puts anything in the way of my searching that house thoroughly or makes any pretence to follow me whilst I am doing so. I want to meet this Maurice Van Nant just as soon as I can, Mr. Narkom, just as soon as I can."