This is an extraordinary book. I found it when researching interventions because of concerns about a family member's addictions. The book is based in both evidence, in terms of what works, and also in love and respect.
Through reading this book and hiring an interventionist (as recommended), along with a LOT of planning and heartfelt discussions, our intervention was successful and the family member remains clean and sober two years later. There are no guarantees in this process, of course, but when our family members prayerfully adopted the approach recommended by the authors, we were able to pull off a complex intervention in a way that we could be proud and conveyed our deep love for this family member, regardless of whether it was ultimately successful or not.
I remain extremely grateful to this book's authors for making is information available to the lay person. I do recommend consulting with professionals as well, as there is much at stake in any intervention. But with this book as a tool, you will have a fighting chance at conducting a loving, successful intervention.