The reference to the “tall, stout old man” (the terms of which Laura was certain that she had repeated to me correctly) left no doubt as to who the intruder had been. I called to mind that I had told Sir Percival, in the Count’s presence the day before, that Laura had gone to the boathouse to look for her brooch. In all probability he had followed her there, in his officious way, to relieve her mind about the matter of the signature, immediately after he had mentioned the change in Sir Percival’s plans to me in the drawing-room. In this case he could only have got to the neighbourhood of the boathouse at the very moment when Anne Catherick discovered him. The suspiciously hurried manner in which she parted from Laura had no doubt prompted his useless attempt to follow her. Of the conversation which had previously taken place between them he could have heard nothing. The distance between the house and the lake, and the time at which he left me in the drawing-room, as compared with the time at which Laura and Anne Catherick had been speaking together, proved that fact to us at any rate, beyond a doubt.