The Sins of the Father – Jeffrey Archer

New York, 1939. Tom Bradshaw is arrested for first degree murder. He stands accused of killing his brother. When Sefton Jelks, a top Manhattan lawyer, offers his services for nothing, penniless Tom has little choice but to accept his assurance of a lighter sentence. After Tom is tried, found guilty and sentenced, Jelks disappears, and the only way for him to prove his innocence would be to reveal his true identity – something that he has sworn never to do in order to protect the woman he loves.