Mary Roberts Rinehart 
Window at the White Cat [PDF ebook] 

Known as the American Agatha Christie, Mary Roberts Rinehart wrote romances in addition to the mysteries with which she rose to widespread acclaim. The Window at the White Cat contains elements of both genres, focusing on a misbegotten love triangle that veers wildly toward a tragic end. When a less-than-ethical politico is found dead, attorney Jack Knox attempts to shake himself from his lovelorn stupor and solve the crime.