Season 4

Jill Garrison thinks her second chance at love will last forever; when her town is best by a killer, she fails to realize she has invited him into her home.

Linda Wittmier and Terry Jo Howard fall in love with James Michael Randall; both of them discover the monster lurking inside him without ever realizing how lucky they were to survive his twisted desire to kill.

As a young boy, Michael Blanco had seen his mother do violent things that seemed straight out of the movies. But he never once doubted that she did those things to keep their family safe—until the day he learned the truth.

Charles Sexton believes his father, Eddie, is God; he and his siblings are loyal disciples until the family descends into madness, and Sexton finds out that crossing his parents means death.

Reginald Brooks began acting strangely, and Beverly Stephens worried that her husband’s bizarre behavior was a warning sign that something wasn’t right. But she never suspected there was a killer lurking inside him.

When Brian Cargill divorces his wife, Kimberly, he thinks it's the end of the worst time of his life; instead, he finds himself in a desperate battle to save his son, Jamie, from her deadly wrath.

Linda is overjoyed after finding out that family friend Greg Scarpa is her biological father; when Scarpa's secrets come out, Linda realizes that being part of his family is not only dangerous, it is potentially deadly.

Brooke Lehman is raised to believe Kevin Dunlap is her father; her mother, Stephanie, keeps the truth a secret, but neither of them realize that Dunlap is keeping far more deadly secrets of his own.