If you are looking for a wide-ranging and grounded study and well-written book with real-life examples, this is not going to be the book. The authors aren't transparent about their research methodology, they often refer to studies but don't cite authors or provide footnotes, and the case studies provided skew narrowly toward traditional corporations, traditional personal relationships, and people working in urban, large corporations. Spirituality is acknowledged as a resource people need but the only examples given are Christianity.
There is useful material in this book (i.e. that there are unseen variables outside of work accomplished and work ethic that will, unfortunately, cause people not to get promotions in the workplace) but most of it (the book was originally written in 2002 and revised in 2016) did not age well.