First, what this book is not: a guide of “how to stay sane” in the popular use of the word “sane”, meaning free from serious mental illness of all and any kinds in general, and especially free from psychotic delusions. Alas, this book will not help with those.
What, then, is it? A guide of “how to stay sane” in the more casual sense of resiliently and adaptively managing stress, anxiety, and suchlike. The “light end” of mental health struggles, that nonetheless may not always feel light when dealing with them.
The author, a psychotherapist, draws from her professional experience and training to lay out psychological tools for our use, as well as giving the reader a broader understanding of the most common ills that may ail us.
The writing style is relaxed and personable; it’s not at all like reading a textbook.
The psychotherapeutic style is not tied to one model, and rather hops from one to another, per what is most likely to help for a given thing. This is, in this reviewer’s opinion at least, far better than the (all-too common) attempt made by a lot of writers to try to present their personal favorite model as the cure for all ills, instead of embracing the whole toolbox as this one does.
Bottom line: if your mental health is anywhere between “mostly good” and “a little frayed around the edges but hanging on by at least a few threads”, then this book likely can help you gain/maintain the surer foundation you’re surely seeking.