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In The Novel Dumb Witness, Hercule Poirot Mentions Four Of The Previous Murderers He Has Caught To Hastings. Referred To By Poirot As 'Quiet, Reliable X', One Of Those People Was Responsible For The Death Of American Heiress Ruth Kettering In Which Earlier Poirot Novel?

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1. In The Novel Dumb Witness, Hercule Poirot Mentions Four Of The Previous Murderers He Has Caught To Hastings. Referred To By Poirot As 'Quiet, Reliable X', One Of Those People Was Responsible For The Death Of American Heiress Ruth Kettering In Which Earlier Poirot Novel?





 
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