Why did Mackenzie write this book? She believes she survived years of addiction, overdoses and near-death experiences to share her truth. "I think the universe shows us some sort of purpose for our lives when you think there's no hope left," she says.
After 31 years of secrecy, Mackenzie says she had to tell her story for herself and others like her.
"In the finding redemption and freedom for myself, maybe I'm going to be giving a little piece of it to somebody else to hold onto," she says. "Having this type of story, and still being here to tell the tale, tells me that I'm still here for a reason."