This is one of the few books that address IT leadership without mincing words. Firstly, he sets the ground work by explaining how IT fits into the overall business. Then explains how IT leadership will always have a reactionary role if it continues to see itself as having to prove value instead of actually delivering value.
Mark not only states the problems IT leaders have in providing value, he also gives useful/ practical solutions. He shows how Agile and other modern delivery methods can be better leveraged to provide relevant solutions to the business.
If you're a CIO or occupy a role in IT leadership, this book is definitely for you. It is well written without the usual jargon and gives a lot to think about.