Four young police officers sent to a rural property are ambushed by violent extremists. They faced the siege at Wieambilla - the point when conspiracy became violence. How will Australian police deal with this new and growing threat?

Richard Dorrough, ex-navy sailor, took his own life in 2014. He left behind a shocking note, claiming to have murdered three people. But with no names, dates or details, no one knew who the victims were...until now.