This book says it's written for corporate leaders, but it's really for anyone who manages, wants to own a business, or wants to establish leadership status in any profession/industry. Basically, if you want to advance, you should be reading things like this; if you're already an executive, you may find this to be a helpful reference.
I would call this an insider's guide to the tools & skills necessary for managing people & businesses, & for corporate advancement. A great reference for existing executives (learning on the fly, diversity, time management, building effective teams, etc), and I would even recommend this to college students & young professionals to learn the culture and skills that are expected when you reach a certain level in your career.
Some of my favorite sections are: innovation management, organizational agility, sizing up people, strategic agility, composure, compassion, functional/technical skills, managing and measuring work, building effective teams, etc.
There are lots of books available on this topic, but this one is very concise, chock full of information (900+ pages), lots of skimmable bullet points, and very comprehensive.