In his book, Isaac describes how he was sent to Epuni Boys home near Wellington at a young age. Three months later he was transferred to Hokio Beach School near Levin where he experienced abuse and bullying.
Isaac says he was always getting involved with "the wrong crowd", committing burglaries and stealing cars. For that, he was sent to a detention centre in Turangi for three months.
Drugs and alcohol were a constant shadow throughout his life and remained by his side as the years went on.
In 1987 he stole a car in Auckland and headed towards Whangarei. He crashed, bashing his head on the dashboard and breaking three ribs.
He made his way back to Auckland to be with his wife and children, but his symptoms worsened the next day.
"I didn't tell my wife what had happened - I just fell asleep. But I could tell something was wrong with me."
Isaac writes in his book that during that time he "lost his mind" and in his "deranged state", killed his two-and-a-half-year-old son and was sent to Mount Eden Prison.
He was found not guilty on the grounds of insanity and was eventually sent to Villa Nine of Kingseat Hospital.
He was moved to Lake Alice and was locked in a secure ward for days.
"I was there about five times over the years, backwards and forwards. They gave me shock treatment.
"If you touched one of their staff you got shocked, they'd turn you into a fruitcake, or they drugged you up to the eyeballs where you couldn't do anything.
"I had visions in there, of the future, God showed me a glimpse of a new life and it brought light to my situation."
Isaac now helps in local homeless shelters in Napier and lets people who are in need stay in his home until they find their feet.
"I love doing it, you meet some amazing people, it's a good way to meet angels.
"You have to go through the hard times to come out stronger, I can stand a lot after what I've been through."
