Sensible advice for mildly depressed people.
Goldstein falls firmly in the camp of "anti-depressants are over-prescribed," so approach with caution in the RA interview and when considering books for yourself. Readers who have already tried all the non-chemical interventions and still feel lousy may feel worse after reading a book that basically argues that you can be happier without drugs. On top of that, while Goldstein is a doctor, he is not YOUR doctor, so stick to what you and your doctor have worked out.
That being said, people who are mildly depressed may benefit from the advice presented here. What's most helpful is that Goldstein explains the science behind WHY all the things he suggests works. Most readers already know that positive thinking, meditation, etc. can help you feel happier, but this book explains the science behind how that works. Five "natural anti-depressants" are explored at length; the most interesting of these, because it is not often covered in books like this, is the growth/learning mindset. Most people go through life with a performance mindset, and measure themselves based on how much they achieve or how close to perfect they get; this is the best way to make yourself sad, per Goldstein, and he offers the growth/learning mindset as an alternative to create positive feedback loops to make you happier. If everything is a learning experience, mistakes are easier to get over, and you're less likely to beat on yourself for them. A nifty theory worth putting into practice.
The book also contains a "natural anti-depressant toolkit," a series of activities and practices designed to help you feel better; there is also a companion website with resources available. For people who want the tl;dr version, there are even a few chapters at the back that summarize the high points in both short form and VERY short form. Book group discussion questions and a thorough notes section round out the text.
The issue of whether or not to take anti-depressants can be a really touchy one, so tread lightly in the RA interview and remember: you're not a therapist. Present the book as it is and either move forward or pull back depending on the response you get. People looking for books on depression might be too embarrassed to talk to you about it, though, so a short "staff pick" note posted on the front with an explanation (example: recommended for mildly depressed people only) might be the way to go. Recommended for larger public libraries' mental health collections; an optional purchase for all others.