Anna Katharine Green 
That Affair Next Door [EPUB ebook] 

First published in 1897, That Affair Next Door is another fascinating study in human motivations intertwined with bits and pieces of circumstantial evidence that at first make very little sense. True to Green’s style, she calls up and explains each motivation, each piece of evidence with mathematical precision until the mystery unravels and the perpetrator is punished in a most fitting fashion.