The best part of this book is the philosophy, as exemplified by the title. Instead of a touchy-feely book about coping with job loss, it takes a matter-of-fact approach to the subject: you were fired, just like lots of people; it seems like a big deal to you, but it's not really a big deal, so get over it, start looking for a new job, and get back to work.
The book is strongest in its initial chapters that discuss dealing with job loss productively and effectively. It gets progressively weaker after that, moving from how to search for a job to collateral topics such as working from home and starting your own business (a topic on which many books have undoubtedly been written). The last full chapter, which is about work-life balance, has nothing to do with the main topic of the book. The advice Johnson gives in these chapters is fine, but nothing new or groundbreaking, and feels like filler for a book that only really contains 150 pages on the main topic.
Also, the book is highly self-promotional, and seems written primarily to generate interest in Johnson's company, Women for Hire, which is mentioned and discussed repeatedly in the book (ostensibly "by way of example" for a point Johnson is trying to make).
There is plenty of useful information, including references to a number of helpful job search-related sites. The book is encouraging while being sympathetic to real-world issues associated with job loss and the job search. But the significant parts relating to the main message could have been written into a book that was half as long, and because the scope of the book is general, you would be well-advised to get more tailored advice if you are looking to identify the best approach to find a job in a particular field or profession.