With evidence from the video surveillance cameras at the casino, Linden and Holder set out to arrest Rosie's killer. It leads to a confrontation, a confession and a death. Linden isn't entirely satisfied with the outcome however as there are still a number of unanswered questions including who picked up Ames at his home in the early hours of the morning Rosie died. The Larsens meanwhile have decided to move into their new home. They're busy packing having come to some degree of closure on the death of their daughter. When Linden and Holder visit them to reveal what has happened, the final clue - and the identity of Rosie's killer - is revealed.