The body of Sarah Kramer, who went missing eight years earlier is found and Jack interviews her widowed father Joseph, who tells him that Martha had been investigating the disappearance. Retired officer Ed Goddard, no friend of Drummond, reports to Gary that Sarah was an informant and Drummond her handler and secret lover whilst Jack also lets Gary in on Drummond's confession regarding Stan's death. Drummond covers himself to the team, throwing suspicion on Mo as the object of Sarah's investigation and her killer, to which he admits but adds that Drummond buried her ...