Detective Inspector Jarrold of Scotland Yard was “a small man with ginger hair and moustache and a suggestion of horsiness in his apparel.” He had been on the trail of Mardenberg, a known spy, when he noticed that George Rowland was also watching Mardenberg rather intently. They eventually crossed paths at a second-class hotel in Portsmouth, where all three had taken rooms. “The Girl in the Train” from The Golden Ball.

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