R. Austin Freeman 
Helen Vardon’s Confession [PDF ebook] 

Through the open door of a library, Helen Vardon hears an argument that changes her life, forever. Helen’s father and a man called Otway argue over missing trust funds. Otway proposes a marriage between him and Helen in exchange for his cooperation and silence. What transpires is a captivating tale of blackmail, fraud and death. Dr Thorndyke is left to piece together the clues in this enticing mystery.