I've just started reading this book. It targets depression. That's true.
Let's forget about the D word. It talks about how to be happy.
Really it focuses on the need of a person to be part of a community, to have healhy relationships, and to have certain needs met, specifically: connection to others, autonomy, self-esteem, competence, purpose, connection to your body (including physical health and sex and stuff), connection to nature (including having pets or plants), spirituality.
This book is right on with the way I've been thinking lately.
So far, I reccommend it.