Ellie and Hardy bring a new suspect in for questioning. In a search of this suspect's premises, Ellie finds devastating new evidence linking him to the crime. Back at the station, DC Katie Harford confronts Ellie and Hardy with an uncomfortable truth about her role in the investigation.Hardy and Ellie's new suspect gives them his detailed version of events, but when they dig deeper they begin to doubt his story.Ellie and Hardy discover that Ian has taken a personal item of Trish's without her knowledge. They seize it for examination. What can they learn from it?