Sir Walter was staring, for he had never seen his rather lackadaisical young friend look like that before. Fisher was looking at Wilson with lifted lids, and the eyes under them seemed to have shed or shifted a film, as do the eyes of an eagle. "Why are you the officer in charge now?" he asked. "Why can you conduct the inquiry on your own lines now? How did it come about, I wonder, that the elder officers are not here to interfere with anything you do?" Nobody spoke, and nobody can say how soon anyone would have collected his wits to speak when a noise came from without. It was the heavy and hollow sound of a blow upon the door of the tower, and to their shaken spirits it sounded strangely like the hammer of doom. The wooden door of the tower moved on its rusty hinges under the hand that struck it and Prince Michael came into the room. Nobody had the smallest doubt about his identity. His light clothes, though frayed with his adventures, were of fine and almost foppish cut, and he wore a pointed beard, or imperial, perhaps as a further reminiscence of Louis Napoleon; but he was a much taller and more graceful man that his prototype. Before anyone could speak he had silenced everyone for an instant with a slight but splendid gesture of hospitality. "Gentlemen," he said, "this is a poor place now, but you are heartily welcome." Wilson was the first to recover, and he took a stride toward the newcomer. "Michael O'Neill, I arrest you in the king's name for the murder of Francis Morton and James Nolan. It is my duty to warn you--" "No, no, Mr. Wilson," cried Fisher, suddenly. "You shall not commit a third murder." Sir Walter Carey rose from his chair, which fell over with a crash behind him. "What does all this mean?" he called out in an authoritative manner. "It means," said Fisher, "that this man, Hooker Wilson, as soon as he had put his head in at that window, killed his two comrades who had put their heads in at the other windows, by firing across the empty room. That is what it means. And if you want to know, count how many times he is supposed to have fired and then count the charges left in his revolver." Wilson, who was still sitting on the table, abruptly put a hand out for the weapon that lay beside him. But the next movement was the most unexpected of all, for the prince standing in the doorway passed suddenly from the dignity of a statue to the swiftness of an acrobat and rent the revolver out of the detective's hand.