There are many books on the principles of lean, how to map value streams, 5S and so on. I am not aware of any other books devoted to how managers should behave in the lean environment. This book concentrates on the management "process" and recommends a number of key behaviours for lean leaders:
1) Leader standard work - i.e. standard tasks, notably walking the work area and reviewing performance on the "gemba", as a regular activity;
2) Visual controls - linking cell and value stream visual management with strategy;
3) Daily accountability meetings.
It is fairly straightforward to understand, and it is a short book (less than 200 pages) but it makes its points well and its clear focus highlights the importance of these simple activities and behaviours for managers to reinforce and sustain the lean philosophy. I particularly like the chapter on people and participation. The book could have an easier style but overall I recommend it for all managers moving towards lean. Without managers displaying the lean culture in their actions, the transformation will not hold.