Hart and Cohle investigate a string of disappearances that may be tied to the Dora Lange murder and the Tuttle family.
Rayna and Juliette prepare for their first concert together in San Diego; Rayna has an interesting proposal for Liam.
Kitty Walker returns home to California after having been estranged from her mother for three years; William Walker brings Sarah into the family business.
After discovering new evidence, detective Jeffries re-opens a 1979 murder case in which he promised the victim's daughter that he would find her mother's killer.
Kitty finds herself torn between two men; Justin's new job is more than he bargained for; Sarah and Joe face their greatest challenge yet as parents.