Over the course of the past two episodes, Michonne and her new friends have come afoul of a rather large and well-organized community that has spread across a bay by making a floating town of boats and bridges. When Michonne discovers a pair of teenagers who were stealing from this group, the leader, Norma, immediately lumped Michonne and her friend Pete in with the thieves.
While Michonne, Pete, and Sam (one of the two kids) did escape from under Norma's thumb, it left her community in a bad way and by the time that Sam leads the others to her home and supposed safety, Norma's brother, Randall, is able to track them down and incite some mayhem of his own.
When Randall is captured, you are given some choices as to how well you want to treat him, but what you learn early in What We Deserve is that Norma isn't far behind and she might have a thing or two to say about the state her brother is in when she gets there.