Detective Jeffries re-opens a 1979 murder case after discovering new evidence. He had promised the victim's daughter that he would find the killer.
Kitty Walker returns home to California after having been estranged from her mother for three years, and William Walker brings Sarah into the family business.
Kitty finds herself torn between two men, Justin's new job is more than he bargained for, and Sarah and Joe face their greatest challenge yet as parents.
When young people partying on a boat discover a body, Rosie and Villa follow the investigation into the world of deep sea treasure hunting.
Sarah, Tommy and Kevin find William's most shocking secret when they set out in search of his lost treasure. Justin makes a startling revelation about his enlistment when he returns from the hospital.