The Evil Shepherd - E. Phillips Oppenheim

A businessman is found stabbed through the heart, the obvious suspect his partner: Oliver Hilditch. Hilditch seems destined for the gallows, but he is saved by brilliant defense attorney Francis Ledsam. It is a defense to be proud of, but Ledsam’s joy vanishes when Hilditch’s wife informs him that her husband is guilty of crimes far more monstrous than murder. Ledsam finds himself trapped between his love for a beautiful woman and a powerful desire to do the right thing—no matter the cost. (Summary by Richard Kilmer)