Francis Dewer is an ordained clergyman in the Church of England as well as a trained counsellor.
Although this book is written for individuals who are thinking about ordination in the Church of England, it is potentially extremely helpful for any individual who is trying to fulfil their God-given potential as a human being. Dewer's thesis is that each individual has a "personal call" from God which is unique to that individual. This personal call is distinct from the call to the role of ordinand and may or may not be compatible with the role of a parish minister.
As most of the book is actually devoted to how one can find one's "personal call", the potential audience for this book is much wider than the title suggests. I believe this book could be of great help to Christians contemplating any kind of career change or even possibly for some Christians suffering from depression.
As an amateur theologian with a BA in theology, I would note that this book is written from a firmly "liberal" Christian theological viewpoint. Anyone who believes that their human self is inherently evil will not agree with Dewer's basic presumption that we are all unique creations of God called to fulfil our true potential. I also doubt it would be useful for anyone who did not believe in God.
One of the best, most uplifting books I've read in ages.