When Nicola Gogarty’s phone rang on 17th July, 2015, as she waited to board a plane in Dublin airport for a holiday, she didn’t know her life was about to change forever. News that her loving, fit and healthy father had been found dead was the first of a series of earth-shattering revelations which sparked a four year battle to expose a catalogue of failings by authorities that meant a convicted murderer was released to kill again.