She knows what she's talking about. The author's daughter is addicted to heroin, so the author has experienced all that she details in this excellent, readable book. She draws on lots of others' experience, as well as good information and statistics (though the book is a little older now), to discuss addiction, how it affects the body of an addict, how it affects those who love the addict, how best to help the addict, and what families must do to survive the addict. Even if readers DON'T have addicts in their families, I would urge them to read this book so that they can understand the issue and exercise compassion, rather than judgment, on families who do experience this awful trauma.