— IV —A STRANGE LIGHT APPEARS
AT THE DESERTED HOUSE
Graham’s intention, logical as it was, impressed Bobby as quite futile. Silas Blackburn had died in this ancient, melancholy room behind locked doors. This afternoon, with a repetition of the sounds that had probably accompanied his death, they had been drawn to find that, behind locked doors again, the position of the body had changed incredibly, as if to expose to them the tiny fatal wound at the base of the brain. Now for the third time those stealthy movements had aroused Katherine, and they had found, once more behind locked doors, the determined and malicious detective, murdered precisely as old Blackburn had been.
Of course Graham was logical. By every rational argument the murderer must still be in the room. Yet Bobby foresaw t
