36 - Evil Shepherd by E. Phillips Oppenheim

When a businessman is gruesomely murdered, all fingers point towards his business partner, Oliver Hilditch. Known for his legal prowess, defense attorney Francis Ledsam steps in to save Hilditch from the noose, securing a not guilty verdict. However, the victory is short-lived when Hilditchs wife reveals that her husband is a perpetrator of even more heinous crimes than murder. Now, Ledsam is caught in a moral quandary, torn between his feelings for a captivating woman and his overwhelming urge to seek justice, regardless of the personal cost. (Summary by Richard Kilmer)