誰是殺人兇手？

Mrs. John Forder had no premonition of evil.When she heard the hall clock strike nine she was blithely singing about the house as she attended to her morning duties， and she little imagined that she was entering the darkest hour of her life， and that before the clock struck again overwhelming disaster would have fallen upon her. Her young husband was working in the garden， as was his habit each morning before going to his office. She expected him in every moment to make ready for his departure down town. She heard the click of the front gate， and a moment later some angry words. Alarmed， she was about to look through the parted curtains of the bay-window in front when the sharp crack of a.revolver rang out， and she hastened to the door with a vague sinking fear at herheart? As she flung open the door she saw two things-first，her husband lying face downwards on the grass motionless，his.right arm doubled under him; second， a man trying frantically to undo the fastening of the front gate， with a smoking pistol still in his hand.