Mark finds himself dealing with a family left reeling from an unexplained assault. David Blackwell has been hospitalized and an innocent passer-by is in a critical condition. Mark needs to find out why this family was targeted.
While the police believe they are closing in on the man hunting David Blackwell and his family, Robert takes a closer look at the relationship between Ali and her sister. Katy still has her doubts about Robert's methods and questions him further.
In the final episode, Sam Blackwell and his young brother Joe head off across the lake and find themselves caught up in a terrifying ordeal. Robert and Mark work to resolve the situation, but events dramatically spiral.