The Last Juror; by John Grisham.

A murder in a small town, a clan that lives in exclusion in its own world, conviction and appeal, jury in danger of life - and life of a small rural family of African descent who do well due to the values given by the mother who cooks for the large extended family and any visitors, feeding them all, and helping their aspirations and growth with very little but her spirit. She is the last juror live from the volatile case.