For the past decade, Dexter has been living a quiet, isolated life far away from the temptations of his past. He's found comfort in a new identity and has assimilated into small town life as a beloved member of the Iron Lake community. When a local hotshot begins behaving recklessly, and a mysterious stranger seems to be on Dexter's trail, he questions whether he can continue to suppress the murderous urgings of his Dark Passenger. Season premiere.

When a simple missing person case turns into a crime scene, Dexter's cabin becomes home base for the search and rescue. Terrible timing for Dexter, who is trying to reunite with his long lost son, Harrison. As Angela and Harrison become acquainted, Dexter struggles to keep his old and new worlds separate.

Dexter hopes to have a chance to make things right with Harrison, which is proving to be tough to do when there's a full-fledged crime investigation that Dexter himself has caused. Harrison joins the high school wrestling team and quickly makes a name for himself at school. Meanwhile, a true crime podcaster from LA arrives in Iron Lake and befriends Dexter's police chief girlfriend.

The father of the person whom Dexter killed makes a surprising announcement which could prove to be a huge problem for Dexter. Meanwhile, Dexter discovers Harrison was involved in a serious incident at the high school. And now this young newcomer is considered a hero to the entire town. Angela digs deeper into a missing persons case.

Dexter's method of protecting his son from drugs unleashes his Dark Passenger in a very impulsive way. Meanwhile Angela and Molly take a trip to New York City that leaves them wondering about a well-respected member of the community.

Someone in Iron Lake has discovered Jim Lindsay's secret identity, sending Dexter on the prowl to find out who it was. This pursuit leads him to realize that he might not be the only serial killer in town. Meanwhile Harrison spirals out of control during a wrestling match and Angela makes a dark discovery of her own.