Mercy Row is a novel set in 1920s and ’30s Philadelphia. It is the story of the rise of a North Philadelphia crime family that was also responsible for building the homes and factories that make up this blue-collar area of the city. Despite the violent trials and tribulations caused by rival gangs from South Philadelphia and Chicago, Jacob Byrne and Franklin Garrett, with the help of the Irish immigrants who settled the Kensington area, build a formidable Irish mob.