Maybe someone who is rather high and mighty (lead priest, noble, wealthy merciant) commits some crime and blames it on a peasant. The peasant is on trial and has done nothing wrong, but there is enough evidence planted against him to make it almost impossible for him to be acquitted. Due to his low station (or just the nature of the crime) the peasant is to be hanged. The PCs have to find some way to clear the peasant's name and bring the true perpetrator to justice.
