Let's make it clear since the very beginning:
* this is NOT a book about leadership
* it's a book about management -> efficient, pragmatic, focused on particular effect
So, if you're looking for tips, techniques, comments regarding: building teams, developing people, aligning to one vision, growing organization, creating a better workplace for everyone, etc. - this is
NOT a book you're looking for.
It isn't a book about project management either - you'll find here nothing about finance, risk, staffing, scheduling, reporting, etc. Go search somewhere else.
This is a book about MANAGING PEOPLE - teams, larger units, etc. And it does it's job - it doesn't present you zillion of techniques, tricks or cases. Instead you're given a short set of very basic principles (/pillars) you should focus on in day-to-day work with your directs. Unsurprisingly these all are around communication: building relationship, giving feedback, 1-on-1s, delegating, etc. In fact, all that really makes sense & truly applicable (NOT fully in every management style though), but this is still far from complete image of an Effective Manager (even if you insist on "managing people" approach).
Anyway, truly good read.