Kellerman assures Lewis that he is seeking some professional advice; he also takes some time off. Lewis is assigned to work with Pembleton and neither is happy with the situation. Together they investigate the murder of a wealthy woman. They suspect the brother may have had a touch of sibling rivalry. Meanwhile, the brother insists that the police have stolen his sister's diamond ring. Mary tells Frank that she thinks they need to talk to a marriage counselor. Cox investigates whether the missing diamond ring might have been taken by one of her staff. She gets Brodie to help her add some video surveillance to the morgue. Mary asks Tim to be Frank's partner again.