This is one of the best leadership books I've read, though is not a quick read. That is, it could be read quickly, but it's deep. It's the sort of book that you may read one chapter per week, and still feel you may want to sit with ideas longer.
It's really a book about personal development, with a deep nod towards philosophy and non-dual awareness, packaged in "exec coach" and business-friendly packaging. The free resources here are useful and may be a great starting point.