Currently, I am going through about 4 books me and my wife.
Clockwork - As stated above. This book is very practical with step by step process of how to take your self out of business and take a 4-week vacation from it.
Profit First- This is about how to take out your profit first and work with fewer resources thereby creating ways how to be more efficient.
Emotional Intelligence - This is how to understand people's emotions and yours and use it to your advantage in business.
100 MIllion Offer - How to create offers customers can't say no to.