The first task this week is the appointment of a new Lead Investigator chosen by Christine, who was killed by the murderer in last week's Killer's Game. She chooses Nick, telling the group he is ""methodical and puts thought into all he does"". Detective Chief Superintendent Bob Taylor reminds the Investigators of the clue left for Sarita by the killer - a key to a caravan in Mill Fields park where Catherine Prior lived before she was murdered. Dean Garretty is now missing, but they are told that a car has been abandoned that fits the description of the car that dumped the video camera. At the caravan site, Team 1 discover that the key does not fit the lock, but then Catherine's father, Frank Prior, Catherine's daughter Anya and her babysitter Vanessa March turn up. Frank tells them that he has changed the locks and lets Anya in to pick up some toys. When they leave, Team 1 search the area for an hour, and eventually come up with what may be a vital piece of evidence - an envelope that r