Chapter 15 JUST OFF THE STRANDA week had gone by. The Nord Express had brought me posthaste across Europe from Petersburg to Calais, and I was again in London. I had left Elma in the care of the Princess Zurloff, whom I knew would conceal her from the horde of police-agents now in search of her. The mystery had so increased until now it had become absolutely bewildering. The more I had tried to probe it, the more inexplicable had I found it. My brain was awhirl as I sat in the wagon-lit rushing across those wide, never-ending plains that lie between the Russian capital and Berlin and the green valleys between the Rhine-lands and the sea. The maze of mystery rendered me utterly incapable of grasping one solid tangible fact, so closely interwoven was each incident of the strang