I am a huge fan and reader of Seth Godin. I have read many of his books and listened to others on Audible. He will inspire you and make you question the status quo. He may hit you where it hurts so don't read his stuff if you have soft skin or aren't willing to change.
In The Seth Godin Interview: How to Become a Leader you can get a snapshot of his latest book Tribes. You'll get insight into Seth's thoughts on leadership with 5 quick questions.
Support your local book store first to see if they have a copy or can order you one. If not, check my sidebar and order from Amazon.