Gallows Thief: A Novel by Bernard Cornwell

The year is 1820. Rider Sandman, a hero of Waterloo, returns to London to wed his fiancÉe. But instead of settling down to fame and glory, he finds himself penniless in a country where high unemployment and social unrest rage, and where men—innocent or guilty—are hanged for the merest of crimes. When he's offered a job as private investigator to re-open the case of a painter due to be hanged for a murder he didn't…