This is possibly the best of the series of the small Ideas in Psychoanalysis books, like the other books its small enough to fit in a back pocket or bag and could be easily read in a single sitting or a couple of train journeys.
The book doesnt have an index or contents page but it does have some good endnotes and references, it is broken down into chapters and the pace and style of writing will prove accessible to the academic, professional or general reader alike. The chapters breakdown as follows: Introduction; Urges and Instincts; Managing Loss; Early Experience and Emotional States; Cut off from feelings; Getting it off your chest; Throwing stones from glass houses; Flooded by feelings; The emotional body; Get Happy; Conclusions.
The book covers a lot and uses brief case studies, literary references and quotations to illustrate its points, explaining how attachment styles develop and effect later emotional/affective states, how, if and when people can or cant process the way they are feeling and the consequences. There's information here which will be useful to anyone wanting to gain some insight and self-understanding aswell as child development, parenting or providing care.
However, keep in mind this is a short overview to an idea in psychoanalysis, its going to prove unsatisfactory in you want more depth and you could have to follow up the references, for instance Winnicotts essays, if you are seeking something with more brevity or composing and essay.
For the general reader this is a good place to start to get a good picture of 'affects', that is emotions which have ideas attached to them, and how they effect daily life.