On the evening of Halloween in 2015, Morgan Hehir was walking with friends close to Nuneaton town centre when they were viciously attacked by a group of strangers. Morgan was stabbed in the heart and lungs and died hours later. He was 20 years old and worked in the local hospital, a graffiti artist who dreamed of moving away and building a life for himself by the sea. From the moment he heard the news, Morgan's father Colin Hehir began to keep an extraordinary diary. It became a record not only of the immediate aftermath of his son's murder, but also a chronicle of his family's evolving grief, the trial of Morgan's killers, and his personal fight to reveal the truth behind the lies, mistakes and cover-ups that led to a young man with a history of violence being free to take Morgan's life that night.