Final episode in this three-part documentary which has aired for the last three consecutive nights. Filmed like a drama, it follows a police investigation over the course of 18 months into the murder of a 19-year-old Bristol student. Tonight, the custody clock ticks as detectives question Luchiano Barnes, however police are yet to find anything concrete to link him to the crime scene. As forensic scientists sample Luchiano's DNA, the victim's family anxiously prepare for a murder trial.