Reeling from Des' change in plea, Jay and the police throw themselves into proving premeditation. If they can show the court that Des was undoubtedly of sound mind when he committed his crimes, he will go down and never be released. If they fail, Des could get a cushier sentence on diminished responsibility and effectively escape justice.As the trial begins and the defence start to tear strips off key witnesses, Jay and his team are shocked by just how flimsy their case against Nilsen seems to be. Could this seemingly open-and-shut murder investigation really be close to collapsing? Meanwhile, Brian is forced to watch the trial unfold in front of him, anxiously wondering how much of an effect his ‘friendship' with Nilsen may have had on this turn of events.