Lots of owner managers have one or two areas of knowledge and specialism - perhaps operations or sales. This book covers all the main areas, and goes into sufficient depth to be helpful, but isn't too academic. I personally found the Finance chapter really helpful, as it explains how to create and use a P&L account to help you understand what is really going on in your business. It also has sections on Personnel, Marketing and Strategy. Fairly easy to read- I took it on holiday and got through most of it.