Extremely dark and unsettling tone throughout. The series deals with themes of domestic abuse, illness, child murder, drugs.
The first season's main antagonist is a controlling, angry, and narcissistic man who psychologically and physically abuses his wife and son. He is also a budding serial killer and sex offender who is attracted to teen girls. Almost every scene with him is unsettling and intense.
The main character frequently has nightmares which are shown as disjointed and fragmented images which are often creepy, sometimes gory.