Mr Holmes, save my sister from whatever nameless horror has just driven this friend of ours to her death! It is late on a foggy November afternoon and a desperate young woman arrives at Baker Street, imploring Sherlock Holmes to help her. She is terrified about what may be going on inside a secretive London refuge for Russian exiles, where her sister works. And so begins a frightening case which deeply strains both Holmes and Watson because of dreadful consequences of failure and the mystifying nature of the forces against them.
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