Mr Tuhoe has been out of the Mongrel Mob for 21 years now and said a lot of people took things from the book and changed their lives.
"We have had guys coming out of prison and saying they have read it and been inspired to get out of the gang life," he said.
Mr and Mrs Isaac said they had been blown away by the response they had received from Rotorua residents during their time in the city.
"People have been so inviting and encouraging," Mrs Isaac said.
"One lady read the book in one day and came back the next day crying.
"She came to see us because she wanted a hug."
"The book is about leaving the gang and all those changes and it's also about family and upbringing; how this can determine where you will end up in life," Mr Isaac said.